Those little ones need their mom!
I watch a lot of TV, so I’ve seen it happen that the custodial parent and family will tell lies about the other parent and turn the children against her/him. Those little ones will believe anything they’re told. I hope that doesn’t happen. I’m not trying to stress you out more, sorry.
Sadly, it is already happening.
This will come back to bite the ex in the butt.
I speak from 1st hand experience with my ex.