Evelyn

I am watching Evelyn, a 2002 movie about an Irish father who tries to retrieve his daughter from an orphanage. His lawyers tell him that his case is hopeless, and one of the authorities says:

You lose because if you were to win this case, the whole basis of family law would be undermined, and believe me, that will not be allowed to happen.

The is supposedly based on a true story from 1950s Ireland, as was later written by the daughter in a book.