@StopTheQtipWhenTheresResistance unless you have financial records you don't know for sure. You said she boasted to other people. This is gossip and hearsay, not usually a foundation for truth. Maybe she made a flippant comment about his beloved £200 as a joke, or to get back to him to irritate him. Maybe nasty people liked stirring up the waters. You should not comment on her finances without knowing everything. I highly doubt that child never played on an xbox.
He is a cracker isn't he? This fabled £200 that he's cried and moaned so much over wasn't even HIS money! He used another child's disability money to pretend he was a generous good guy! He is either a financial abuser stealing another child's money, thus ensuring that child suffers or you are being abused and allowing this fine example of a man to take your child's money and thus condoning financial abuse and misuse of a disability payment. Or it just sounded better.
Either way, your story needs to be rewritten to:
My crap husband, who pays a reduced amount of CMS, unwillingly due to living with another child, took/stole from a child, a large proportion of their disability payment and passed it off as his own money given to his biological child. He was morally outraged that this stolen money wasnt spend how he liked.
He really doesn't have the moral high ground here.
Either you knew he was taking money from your own disabled child or he did it without permission. He told you that he gave it to his ex for his child (again hearsay and told you how it was spent, apparently).
If you disagreed that your child should support his child by unknowingly being deprived for THEIR, not yours and certainly not his money, then you should have gone to the Police about the theft and also reported yourself to the DSS as unable to be a safe guardian of your child's money.
No way would I allow a man to parade around bestowing funds he claims are his, that he took from my child. You need to look at coercive control and financial abuse. That money is to help your child. If one month you don't spend it put it in a savings account for them.
Your story is not an example of a kind hearted, generous Dad, paying above the government accepted pittance to support his child. He's a great example of what we are talking about here, feckless men.