I have DS (only child) five days per week, he's with his dad for two nights. Usually on one of those two days he's actually with his dad's parents.
DS is always happy to go there, and particularly loves his granny.
DS has not hit me since he was probably two years old, maybe just turned three.
His dad says that he regularly hits him and hits his grandparents too (not as often). He says that he tried to be more strict but it just ends in an argument.
Today, he took him to soft play and he hit another child. I could not believe it when he told me, this is NOT even close to the type of behaviour I've ever seen DS exhibit towards other children. Ever. He was also screaming at his dad's new girlfriend and her son who is the same age.
We've had issues with bad behaviour at his dad's before, probably for the last year or two. But nothing like this.
I'm at a complete loss. When with me or my parents, we barely even notice he's there. He's easy going and wouldn't even dream of hitting us.
Does anyone have any advice?