I agree with everyone who has said to keep on doing what you're doing Hope. There may come a time when they'll listen to their mum and will realise that whatever their father has told them about you is untrue.
I hope your daughter does leaves this awful man and will be able to find peace and happiness in a life without him and that one day you'll be a family again with your GS's.
AIBU To Be So Annoyed at the Stupidity of This


there is always hope.