Now seven, the girls live completely different lifestyles with one living overseas and attending an international private school and the other receiving state primary education and living with her new family in a terraced house in England.
The case has similarities to that of Gammy, a Down’s syndrome baby born to a Thai surrogate.
The child was at the centre of an international outcry after his Australian parents were accused of leaving him in Thailand with his surrogate mother Pattaramon Chanbua, 21, and taking home the healthy twin.
The couple, David and Wendy Farnell later denied this was the case insisting that the Thai mother would not hand over Gammy and have said they want to get the seven-month-old baby back.
Pattharamon Chanbua later told Associated Press that she feared the baby would be put 'in an institute'.
In the recent case in Britain, the grandparents involved insisted the matter should have gone before High Court judges, accusing the council involved of 'mishandling' the situation, the Sunday Times reports.
They told the newspaper that the baby girl's parents were top executives at international companies and were working overseas when they flew back to Britain and handed the child to social services.
According to the report, they have been fighting to maintain contact with the adopted child and had 'begged' the council involved to get advice when the babies were separated.
The grandparents revealed how their son and daughter-in-law did not have an amniocentesis test - capable of diagnosing Down's syndrome - when they found out they were going to have twins in 2006 fearing they would lose the pregnancy.