I've tried to help with her kids and they won't listen to me and I'm not very good with what to do with kids .

And when I say surely kids should behave I don't expect them to sit and do nothing but I assume it doesn't involve screaming and destroying belongings
:-( Sounds like a no win situation & I agree they shouldn't destroy property, anyones. I'd take it up directly with your friend or look for alternative places to meet up