My sister's ex was a horrible man and very abusive. They split 4 years ago and have been in and out of the courts since. She doesn't want him to have anything to do with her DD. He has just stopped paying maintenance. I hope this will go against him in court. But I assume he is legally obliged to pay? I work, she doesn't, so now she is constantly asking me for money. But I have my own child and business, so my own money issues. Should he keep paying even with no access? My niece is 6.