My son is 2 and my father always plays rough with him, flinging him about onto the sofa, tickling (past the point where my son clearly can't handle it and can barely breathe), holding him upside down and he holds him by his wrists and allows him to climb up his body. I have repeatedly said no to the play fighting because I have noticed my son being out of control, hyped up, and recently sometimes hitting (never ever does this any other time). I have also said under no circumstances is he to hold him by the arms or wrists because he actually dislocated my arms when i was a child doing the same thing.
Every other visit it is like he "forgets" and I have to intervene and then he says "oh we have to stop mummy doesn't like it", no you have to stop because you're going to break his frigging arms!
I don't want to micro manage their relationship but it's really getting me down, my son is naughty after he visits and i am terrified he's going to damage his hands and arms. My son has also started to try and play rough with his younger siblings and has ended up hurting them quite a bit now (accidentally).
In my house I am able to intervene, however he also goes to his nannas for play dates (not childcare) and my dad is there and his nan has promised that she won't allow it but I have seen photos on facebook of my son being held and swung by his wrists again.
I feel so powerless and i don't know how to handle this. my dad goes funny if i question anything he does and i have to really tread on eggshells with him. I don't know what to do because i have said "i don't want you to do that, stop, no" etc but when he "forgets" it's too late and i am worried about the consequences.
My son is starting to think i'm horrible because i'm always ruining their "fun".