DS4 spends 1-2 nights a week at his dad's, when it's just one night the other is spent with his parents (DS grandparents).
When he is there he "kicks off" according to ExDP. Hits, kicks, shouts, screams, refuses to go to bed until very late.
He is not like this when with me or my parents - at all. I can't remember the last time he hit or kicked me, definitely in over a year.
Of course he has tantrums when he's over tired or upset etc. but they are rare and never that extreme.
It comes across that ExDP and his parents feel I am to blame for his bad behaviour with them.
Does anyone have any idea why he could be behaving like this when with them? Or what I can do to tackle it?
I always enforce consequences when his dad drops him off and tells me how he has been.
I'm at a loss tbh.