I don't know how to fight this anymore. - Comments

I get this, I really do. I have one sister, a younger sister. She lives in the room beside mine and we haven't spoken for about 6 months. For the third time now. Every time we made up it was because I spoke to her or she was kind to me out of the blue because she needed to borrow money. And at first people were like "ohh you're family you should get along you're being really silly" but psychological and even sometimes physical abuse isn't cool.
If someone causes you that much pain just... fuck them. I hope your sister sees it from your side one day.

I'll give you the only advice I can.

Wait until the children grow up a bit more.

If your sister is as terrible as she sounds, there's nothing you can do. My friend went through something similar but with her brother's baby mother. She wasn't allowed to see her niece. It killed her because her niece is her life.

She had to wait. When the kids are old enough to understand, and you can seek them out on their own.. then your sister has no say.

If you don't want to wait... save every attempt you make. Photograph it, save it and when they say something about it, show them. Tell them you tried and they stopped you.

Other than that, its outta your hands.

I'm sorry you gotta go through this. Its painful when kids are involved.