My ex won't let my kids come back to mine and my boyfriends house because they've told their dad he was mean to them, and told them specific things. My daughter says he threw a gatorade bottle at her head, my son says he squeezed him till he couldn't breathe.

I had guardianship of my nephew as well, but today my mom took him from me saying he's saying my boyfriend is also mean and that he squeezed him also.

Basically none of my children can come back to my home. Luckily my ex lets me go to his house whenever I want to see my kids, and I can take them anywhere as long as my boyfriends not around. As far as my nephew, I don't know what's going to happen.

I of course believe my children, but I can't tell if maybe they took what he considered joking or pickin to seriously, because he tends to do that. He torments kids, even his own daughter he seems to love him to death. He never hurt, or bruised them to my knowledge, and for some reason none of them ever said anything to me.

I need opinions on the situation.