You left HIM due to emotional abuse right?
They are his boys, right?
Have you ever heard about apples not falling far from their tree?
He thinks it's normal because he bullied you so badly that you LEFT him.
Did you seriously think that he wouldn't abuse, or allow others to abuse your children?
How could he not? That's what he is, he doesn't know any better.
These are your kids, they are very young, and totally unprepared to stand up to dysfunctional adults.
Leave them in this situation, they'll think it's normal to be treated like this, or behave like this towards women.
Your dd may go on to have a DV relationship (like you did) and your ds may grow up to either experience the same or perpetrate it. Just like his big brother. He'll bully your dd fisrt though.
This 19yo is an adult, and he is bullying a 5yo. He is being left unsupervised with her.
Her dad 'doesn't see the problem'
You need to step up, and make some noise. Fuck the 19yo and it 'not going down well' that'll make him retaliate next time and threaten her to keep quiet.
Overnights stop, and he can come and see them away from the bullying 19yo.
Any normal father would be furious about his baby girl being upset like this. He thinks it's funny.
Why on earth do you expect him to be any different to how he was with you? Why do you think he's magically become a good person, good enough to have your little ones?
He was too toxic for you, why would he be any better for anyone else?
Before you say, he's a good dad. He's not. Never was, and never will be.
Get angry! These are you children here!