Trigger warning: SA ~ if you were molested as a child, will the person who hurt you also do that to their own kids?

Long story short my first memories are of sexual assault leading up until 1st grade by my big cousin who is 10 years older than me. So my family when I told them at first didn't believe me until I kept on saying it as a teen. Then they said he was “just a kid” and didn't know any better. Which is true he was about 13/14 at the time I was first molested by him. But he also did it to his step sister for much longer that actually led to them having “consensual” sex when she was 13, he is 11 years older than her and she is 1 year younger than me, which thrre is no such thing as a 12 year old consenting to sex with someone not their age(I have talked to her about this so many times every time she tells me she wanted to, she doesn't understand she was raped). So he was old enough to drink, and at the time was brand new married to his wife who was abstinent until marriage. Anyways.... they now have 3 kids, 2 boys and 1 girl. I am not aloud to see the kids(I refuse to see him and I'm not aloud by his kids Anyways). But everytime I see them once in a blue moon I'll see them at my aunts house unintentionally. I feel absolutely terrible like i want to vomit every time I see his daughter and I always want to ask her if she's doing ok and if anyone is harming her. But my aunt won't let me anywhere near her or the boys when I go over there, which upsets me because I don't just go over there when they're there it's always they just so happen to be there. So basically I cut her off now too. It's keeping me up at night. Anyone have experience with this? Not sure what group to post in hope it's ok.