One twin wanted to take parental responsibility from the other for child P after both had sex with child’s mother One twin wanted to take parental responsibility from the other for child P after both had sex with child’s mother A woman who had sex with identical twins within four days of each other is unable to ensure one of them takes parental responsibility because it is “not possible” to know which is the father, the court of appeal has said. One of the twins was registered as the father on