As a side note.....

I know someone who was in your sisters position they had custody of her brothers son for several years for whatever reasons I wont go into.

When the brother wanted his son back he was a young teen, the sister who had been a mother to the lad was devastated at the thought of losing her 'son' she had no other children and had fallen in love with this child.

The lad went to his father and the sister sees him sometimes but not often as the father really doesn't want it. Its a heartbreaking situation as the sister was good enough to look after the son for some years but now has nothing.

Sad all round I feel.