He's eight. There's a bit of back story, DSSs mum made all sorts of accusations against my DH (all untrue). We spent 20k in legal fees to get access.
DH has had over night custody for 16 months now. DSS refuses to sleep in his own room here (which we did to his taste) saying at home he sleeps with his mum. DH asked his ex if this was true when we had him for a couple of nights in the summer holidays and she said yes. I don't know how to handle it to be honest.