Amazing.....      Have you looked into putting your son into a place that will help him with these issues?    Where you can still work full time?     My daughter in law works at a place that help children learn to cope with these types of issues.    She has a heart of gold in my thoughts for sure.    She has been kicked, biten, punched, spit on and more.    Yet she is 100% in love with her job with seeing how she can help these children.   

 

A child needs both parents...    It doesn't sound like you have put your children first.    That you want to force the ex to sign over his rights.     Like people do with things they sell...   by signing a bill of sale.   Children are not items for sell.       I would think maybe trying to get their father in their lives.   Maybe that is the reason for the outbursts.   Who knows...    I hope your child can find the right fit in their life to help them.