THE mum of a missing aristocrat has begged her daughter to come home in a heartbreaking letter.
Constance Marten, 35, and her rapist partner Mark Gordon, 48, vanished with their newborn baby after their car was found burning on a motorway on January 5.
Now, Constance's mum Virginie de Selliers has begged her to come home.
She : "Open Letter to My Darling Daughter Constance.
“I know you well enough; you are focused, intelligent, passionate and complex with so much to offer the world.
"So many of your friends have come forward to say such positive things about you, assuring us of their warmest love and support for you and your family.
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“You have made choices in your personal adult life which have proven to be challenging, however I respect them, I know that you want to keep your precious newborn child at all costs.
“With all that you have gone through this baby cannot be removed from you but instead needs looking after in a kind and warm environment.
“I want to help you and my grandchild. You deserve the opportunity to build a new life, establish a stable family and enjoy the same freedoms that most of us have.
“Constance, I will do what I can to stand alongside you and my grandchild. You are not alone in this situation. We will support you in whatever way we can.
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“I am ready to do what it takes for you to recover from this awful experience so you can thrive and enjoy motherhood.
“I love you and miss you, Mum xx."
The family have been missing since their car broke down and burst into flames on the M61 on January 5.
Shortly before going missing, Constance gave birth to Gordon's child "with no medical attention".
They then travelled to Liverpool before heading to Harwich, Essex, via taxi at around 3.30am on January 6.
The couple were seen by a member of the public in Harwich on January 7, police say.
Officers also received a number of confirmed sightings of the family in Colchester January 6 and 7.
The couple were then placed near East Ham Station in London on January 7.
They are believed to have been sleeping rough after being spotted buying camping equipment from an East Argos on January 7.
The same day, they were seen on grainy CCTV dumping their baby's pram at 11.46pm.
New CCTV shows the pair walking along Cantercrow Hill in Newhaven and into the fields beyond.
They were carrying a number of bags and their blue tent.
Cops fear they were camping in the area, but could have moved elsewhere as time has passed.
Detective Superintendent Lewis Basford, who is leading the investigation into the family's disappearance, said: “For a month now Mark, Constance and her newborn have been continually on the move in sub-zero temperatures with no medical attention and we are increasingly concerned for their wellbeing.
“We know that the baby was still alive on January 8 and finding the baby remains our top priority.
"Maybe you have information but were reluctant to come forward to help us find the family.
"It does not matter why you did not speak to us earlier, what matters is doing the right thing now for the good of this highly vulnerable infant.
“If you have seen the family, if you gave them directions, if they got into your taxi or came into your shop to buy food, drink or nappies - no matter how small a detail it may seem - please do get in touch.
"Please also be assured that if they have paid you to provide a service, a lift, somewhere to stay or something else, you are not in any sort of trouble, we just need you to tell us what you know so that we can find them and make them safe."
It comes after an old pal revealed that Constance "could have gone very far" as an actress before she became estranged from her aristocratic family.
Constance was deemed an 'it girl' when she appeared on upmarket mag Tatler's babe of the month page while she was a student in 2008.
The daughter of Napier Martin, a former page to , and granddaughter of Mary Anna Marten, whose godmother was the Queen Mother, Constance comes from a family of wealthy landowners.
It is believed that she paid for her time at drama school via a multi-million pound trust fund stored at C. Hoare & Co, the UK's oldest private bank.
However, she has reportedly led an isolated life since moving in with Gordon in 2016.
The 48-year-old is a convicted sex offender who served 20 years in a US prison for rape and battery.
Constance's dad Napier previously begged his daughter to come home.
In a heartfelt plea, he told : "Darling Constance even though we remain estranged at the moment, I stand by, as I have always done and as the family has always done, to do whatever is necessary for your safe return to us.
“I beseech you to find a way to turn yourself and your wee one in to the police as soon as possible, so you and he or she can be protected. Only then can a process of healing and recovery begin, however long it may take, however difficult it may be.
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“I would like you to understand that the family will do all that is needed for your well-being. And I also wish you to understand you are much much loved whatever the circumstances.
“We are deeply concerned for your and your baby’s welfare.”