A mate of mine was in a similar position to you.
It was awful, everytime he took his ex to court it cost him money he could have spent on his son, especially as she'd refuse to cooperate with what the court had instructed.

She was safe in the knowledge that the court won't take any action against her as if they impose a financial penalty, that'll be robbing the kid of much needed money, and they aren't going to send her down as 'a kid needs a mother'.

Have you tried to speaking to the mother of your ex and seeing if she'll apply any pressure on her daughter?
( JeffTheDogFucker Can you dig it?, Mon 28 Mar 2011, 11:34, 1 reply, 15 years ago)

Her mother is an utter, utter cunt and definitely the parent my ex gets her unpleasantness from.
Her father is a nice, quitely spoken and utterly henpecked man who just wants a quiet life. He'll be of no use but probably sympathises.
( Monty Boyce, My cheese game is strong, Mon 28 Mar 2011, 11:36, Reply)