Pedophile step brother

I guess I just need to vent. I feel very alone and oppressed by my family dynamics. I feel wrong for expressing my anger because it’s been so many years now.

My (step) brother (whom I’ve known my entire 26 years of life) is a registered sex offender. He’s served time in prison. Multiple victims, some whom I know haven’t come forward. My family has tried to just sweep everything under the rug. He met a girl, she had a son. I’ve tried to play nice at family gatherings amongst the dysfunction, just “move on”. But I was just informed his girlfriend is pregnant again... and that he’s also been talking to another “girl”. Obviously he’s the same pervert. I feel so, so angry because I am also pregnant (with a daughter). I feel mad that I have to “share” any of this time with his girlfriend. I pray to God this child is not a baby girl!!! I’m just so angry from so many different angles. I worry about ever bringing my daughter to my dads in case my step brother ever comes around. My parents didn’t protect me, why would they protect my daughter?

How is this happening? How is this ok?