- Brigitte Brueckner spoke to MailOnline from the doorway of her modest home in Bergtheim, near Wuerzburg
- She said she knew nothing of estranged son's life in Portugal, adding: 'I don't want to know anything about it'
- Neighbours revealed Christian Brueckner was thrown out of adopted home because of disruptive behaviour
- It comes as Brueckner is being linked to two other child disappearances in 1996 and 2015, respectively
Madeleine McCann murder suspect Christian Brueckner was thrown out of his adopted home because of his disruptive and criminal behaviour, MailOnline can reveal as his parents are exclusively pictured for the first time.
Brigitte and Fritz Brueckner had taken baby Christian into their family as an act of charity for the tiny foundling who had been given up by his mother.
But the kind-hearted parents sent him to live in a reform home for delinquent teenagers after Herr Brueckner was seriously injured in a car crash and could no longer discipline the boy.
Widowed Frau Brueckner today told MailOnline she knew nothing about her estranged son's alleged crimes.
Standing inside the doorway of her modest home in Bergtheim, near Wuerzburg, she told MailOnline: 'I don't know anything about it. I don't want to know anything about it.'
She distanced herself from the 43-year-old prisoner as neighbours revealed the family's difficulty in controlling Christian.
They told of how Frau Brueckner could not cope with Christian's disruptive and increasingly criminal behaviour and simultaneously look after her disabled husband who suffered brain damage and was confined to a wheel chair following the smash in 1992.
It came as Scotland Yard revealed it had received 400 tip-offs after convicted sex fiend Brueckner was names as the key suspect.
Today neighbours of the couple in the village of Bergthei, where he grew up also told of their shock that Brueckner has been linked to the murder of three-year-old Madeleine in 2007.
One neighbour told MailOnline: 'The Brueckners were a lovely couple, very kind. But what happened with their boy Christian is a catastrophe.
'They took him in as a baby and brought him up as their own. He was often in trouble and he got worse and worse as he grew into a teenager. Christian must have been 13 or 14 when Herr Bruecker, Fritz, had the car accident.
'As the man of the house it was Fritz who disciplined the boy. Christian needed a firm hand. But after the accident he could not do that any more.
'Brigitte, the mother did her best, but she could not cope with the boy and look after her husband. Christian had been in trouble and that is when he was sent to a reform school for delinquent teenagers in Wuerzburg.'
She added: 'Sadly Fritz, the husband is dead now. But his wife Brigitte did everything she could for him. She was awarded a medal.'
Another neighbour added: 'Brigitte is a lovely woman. I knew Christian but I have not seen him for years.
'If what I read is true it will destroy his mother. Brigitte and Fritz did everything they could for him when he was a boy.'
A close family friend revealed the discovery of Brueckner's alleged involvement in the murder of Madeleine will destroy his mother.
Monica Veirheilig told MailOnline: 'This will destroy Brigitte. For your child to kill another child is the worst thing imaginable for a mother.
'She is a kind woman and she has already had to deal with tragedy. She had to cope with looking after her husband after he suffered brain damage in the car crash and later his death.
'But finding out her son may be a killer is a second tragedy for her.'
She added: 'I don't want to judge Frau Brueckner. I hope Madeleine parents will finally find out the truth about what happened to her. The not-knowing must be the worst.'
Another neighbour has told how Christian Brueckner and his brothers had bad reputation in their home town while growing up.
A mum-of-three who knew Christian growing up said he was well known in the area for getting in trouble.
The mum of three told MailOnline: 'I knew Christian growing up - I was two years younger than him so I wasn't that close to him but I knew him well because of his reputation.
'He was well known in our area for getting in to trouble. Everyone knew that he was handful and was not easy for his parents...I was a child at the time so I can't remember the details but I remember other adults talking about the fact that Christian was not easy for his parents.
'His parents are lovely people. They are very kind, they obviously must be because they adopted three boys.
'I was fully aware of the Madeleine McCann case, everyone does. I was horrified when I heard that the suspect is from a family that lives over the road from me.
'You never thing something like this is going to come to your doorstep. It makes me feel so bad that he might be involved. I just hope for the poor parents of Madeleine that the case is resolved soon.'
Brueckner, now 43, is the key suspect in the disappearance of three-year-old Madeleine from Praia da Luz, Portugal, in 2007.
He moved from Germany to the Portuguese coastal town in 1995 after serving part of a two-year sentence for molesting a six-year-old girl in Wurzburg.
Following his naming by German police, he has further been linked to the disappearances of six-year-old boy René Hasse in the Algarve, 1996, and five-year-old girl Igna Gehnricke in Germany, 2015.
Now languishing in a German prison in Kiel, at the time of Madeleine's vanishing he was living in the area about a 10-minute drive away.
In 2005, two years prior to the infant's disappearance, he raped a 72-year-old American woman on a waterfront villa less than a mile from the Ocean Club hotel where Madeleine went missing.
Prosecutors in Germany are now desperately trying to build a case against Brueckner, who is eligible for parole this weekend.
Information continues to pour into Scotland Yard's Maddie squad Operation Grange. A force spokesperson said today: 'We have now received just short of 400 pieces of information. We are pleased with the amount of calls and emails coming in and we are assessing them and prioritising them.'
Maddie's parents Kate and Gerry of Rothley, Leicestershire, 'continue to hope she is alive until they can be shown incontrovertible evidence which proves that she is dead,' family spokesman Clarence Mitchell said.
He told MailOnline: 'Kate and Gerry continue to be encouraged by the level of response and nearly 400 fresh pieces of information so far is exactly what the Met wanted from their appeal.'
Did Christian Brueckner snatch this boy too? German cops contact family of six-year-old who vanished near Praia da Luz in 1996 after running into the sea while new Madeleine McCann suspect was in area
By Emer Scully and Paul Thompson for MailOnline
The family of a six-year-old boy who went missing in the Algarve 24 years ago have revealed they have been contacted by German police in the wake of the Madeleine McCann developments.
René Hasse's father Andreas Hasee told his local newspaper that an investigator from the Federal Criminal Police Office (BKA) phoned him yesterday, for the first time in 20 years and said they were re-investigating the case.
The six-year-old from Elsdorf, Germany, was on holiday with his family in Aljezur - just 25 miles from Praia da Luz, in the Algarve - when he vanished on June 21, 1996.
The prime suspect in the disappearance of Madeleine, Christian Brueckner, now 43, moved from Germany to Praia da Luz in 1995 at the age of 18. He was already convicted of sex offences against children and would have been 19 at the time René disappeared.
The schoolboy went missing after running towards the sea and his family and the authorities had previously accepted René drowned in a tragic accident.
He had been running ahead of his mother and step-father during a walk on the beach. After losing sight of him, they never saw him again, with just his clothes left lying on the beach.
Andreas Hasee, René's father, revealed an investigator from the Federal Criminal Police Office (BKA) contacted him today - the first time he had heard from police in 20 years. He told German newspaper Kölner Stadt-Anzeiger: 'There could be a connection.'
This comes as MailOnline can reveal the paedophile suspected of abducting Madeleine carried out a brutal rape at a beach front villa less than a mile from where the three-year-old disappeared in 2007.
Brueckner broke into the secluded home two years before Maddie went missing from her family's apartment in the resort of Praia da Luz.
A 72-year-old American woman was tortured and raped by Brueckner who filmed the savage attack. He was jailed last year for seven years by a German court after DNA evidence linked him to the assault.
The villa, called Casa Jacaranda, is just a ten-minute walk from the Ocean Village apartments where Maddie was sleeping in a ground floor apartment when she was snatched 13 years ago.
It has also been revealed that paedophile Brueckner, 43, vowed on a web chat to 'grab himself a little something and abuse it for days'.
He fantasised in an online chatroom in September 2013 about kidnapping and sexual abusing a child, according to German magazine Der Spiegel.
He allegedly added it would be safer 'if the evidence is exterminated afterwards'. The German word he used, vernichten, is the same word the Nazis used for the final solution.
Mr Hasee, who had accepted his son had drowned, added: 'René went to Portugal with my ex-wife and her new partner.
'He was actually also a very careful child, he would not have easily climbed into the Atlantic alone. Of course you start thinking, yes. I don't imagine that René is still alive,' he added.
An expert at the time found tide and current conditions in the sea made a swimming accident unlikely and BKA police officers in Germany have maintained other victims could be linked to the Maddie investigation. The force declined to comment on René Hasee.
It comes after prosecutors re-opened the investigation into whether Brueckner abducted five-year-old Inga Gehricke after she was grabbed from Diakoniewerk Wilhelmshof in Saxony-Anhalt during a family outing five years ago.
Her disappearance on May 2, 2015 - almost eight years to the day after Madeleine vanished in Portugal on May 3, 2007 - was only 48 miles away from where Brueckner lived on the five-acre site of a box factory in the isolated of village of Neuwegersleben, south-east of Hanover.
One day before Inga went missing, Brueckner's vehicle was in a minor crash at a service station close to where she wandered away.
More than 100 officers descended on the old box factory in February 2016, digging holes looking for Inga's body.
The little girl wasn't found but Brueckner's USB stash of child sex abuse images was found on a USB stick hidden under 'animal bones' with police now set to return, according to German tabloid Bild.
Brueckner was prosecuted over the child porn but he was never charged with Inga's disappearance when the probe was dropped after four weeks.
He refused to comment about the disappearance recently when questioned in prison by German police. A Met Police detective from the Operation Grange team is also thought to have been present at the time.
But today prosecutors confirmed they have reopened a preliminary investigation into whether he was involved in the unsolved Inga case.
Stendal Public Prosecutor's Office spokesman Birte Iliev said: 'It is now being examined whether there is any new evidence in connection with the murder suspect in Braunschweig.'
Petra Küllmei said: 'Just a day before Inga disappeared near Stendal, Christian B. was seen nearby on the A2. The file was closed again only four weeks after starting work. I think that's not very ambitious.'
Last night Portuguese police last night hit back at claims that Madeleine McCann suspect Brueckner slipped through their net.
Policia Judiciaria insisted the German's name was one of those passed to British police in case files in 2012 – and said Scotland Yard had never asked them to take a closer look at him.
Deputy director Carlos Farinha said: 'If the suspicions about this man were so obvious, he would have been the subject of requests made by the British, which were always authorised by Portugal, but those requests about him were never made.'
In an interview with Portuguese news agency Lusa, he added: 'If the PJ is being accused of giving Brueckner a lack of priority, the same could be said of the Metropolitan Police. In theory everything could have been different but in 2007 and in 2012 we didn't known what we knew in 2017.'
He said this week's fresh appeal was an initiative of the German police who were convinced it could lead to additional information coming in.
But appearing to hint that the evidence the three police forces have may not be enough to bring charges and a successful prosecution, he said: 'Suspicions about the German national have grown but unfortunately they are not enough to make him an arguido and formally accuse him.'
It also came as documents revealed by Spiegel allegedly show Brueckner fantasised in disgusting online chats about the kidnapping and sexual abuse of a child in September 2013.
Madeleine McCann prime suspect Christian Brueckner was released from Portuguese prison just months before three-year-old vanished from Praia da Luz villa
By Paul Thompson and Harry Howard for MailOnline
The paedophile suspected of abducting Madeleine McCann had only been released from a Portuguese prison just months before her disappearance from a family villa.
Christian Brueckner served nine months in jail for robbing a petrol station in 2006 and was released in December - just five months before Madeleine went missing.
Soon after his release the three-year-old girl disappeared and has since been the focus of a worldwide hunt with the 43-year-old German now the prime suspect in her disappearance.
Brueckner was imprisoned after leaving a petrol station in the coastal resort of Portimão, just over 20 miles from Praia da Luz, the resort where Madeleine disappeared.
It also emerged that the Brueckner had previously been jailed in 1999 after carrying out a string of thefts from villa's and apartments in and around Praia da Luz.
He was known to supplement his income from drug dealing and working in restaurants by stealing from homes.
In 2005 he broke into a luxury beach-front villa where he raped a 72-year-old American woman.
It was thought he had initially entered the property to steal valuables rather than carry out a sex attack.
Police sources said Brueckner's name was well known to them from his previous crime with his fingerprints and other details on their files.
This led to his name being included among the hundreds of suspects identified as part of the Portuguese police investigation and later passed to Scotland Yard who launched their own inquiry into the disappearance of the three year old.
Brueckner, who is serving a seven year sentence in northern Germany for the 2005 rape, was first jailed in 1999 three years after settling in Portugal.
He spent two months in jail in the city of Evora in central Portugal.
After being released he stayed out of trouble and relocated to the Algarve, moving into a remote villa in the hillsides above Praia da Luz.
But in 2006 he was convicted of driving away from a petrol station in the coastal resort of Portimão and jailed for nine months.
He was released in December of that year – a few months before Madeleine went missing on May 3rd, 2007.
At the time of Madeleine's disappearance he was understood to have been living in a distinctive camper van.
As he was known to police his name was one of 600 that became suspects in the hunt for the missing toddler.
It is not known if Portugese police contacted their German counterparts to find out if he had any other convictions.
Had they done so they would have discovered a string of sex offences starting from when he was a teenager.
Portuguese Police have insisted that they passed all the relevant details on Brueckner to Scotland Yard in around 2012.
Carlos Fariniha from the Portuguese Judiciary Police (JP) said British police, who launched Operation Grange to locate the missing girl, showed no interest in the name of Brueckner and did not ask for any further details.
He said it wasn't until 2017 when German police provided information on Brueckner that they became interested and have since launched a new appeal for witnesses to come forward.