In a judgement sure to raise eyebrows all round, a UK court has imposed two fathers on a boy, one biological and the other who reared him, despite protests from the mother.
The country's most senior family court judge, Sir Mark Potter, decided that a man who brought up the boy believing him to be his own child was entitled to parental rights too - even though he turned out not be the father.
The court ruled in the man's favour, despite the mother's plea that he will use his role as a father "in an officious and controlling manner, productive of strife rather than harmony".
The boy was born in 2002 soon after the couple formed their relationship and the man - referred to only as "Mr A" - believed he was the father.
He cut the umbilical cord and "was involved as a father from the start," the President of the Family Division, Sir Mark Potter, told the court.
The boy, identified only by the initial "H" in today's ruling, was brought up "on the assumption that Mr A was his biological father".
It was only after they broke up in 2004 that the mother told him that the boy, then aged two, might not be his.
DNA testing later proved the true father was a man with whom the mother had a relationship very shortly before she met Mr A and with whom she had had sex during the same menstrual cycle.