UPDATE: My (27F) half-sister (8F) is very violent towards me and hates me. I have to babysit her, but I'm going to give birth in 3 weeks and I can't take it anymore.

Previous post:
https://www.reddit.com/r/relationshi...nt_towards_me/
I would like to thank everyone for the great advice! Most, if not all, of the comments highly suggested to stop babysitting my half-sisters, so I stopped.
It's kinda funny now that the title of my post says :"...I'm going to give birth in 3 weeks...", because I went into labour only three days after posting that. Personally, I believe that the stress from babysitting my sisters caused the early labour but I'm not 100% sure. The birth was okay and my baby is healthy! :)
Well, but here's the unpleasant part. I had to stop having contact with my mom and my step-dad. They wanted me to continue babysitting despite me telling them that it's unsafe for me at this point. Two (!!) days after I gave birth my mom asked me to babysit my sisters again. It resulted in a horrible fight because I said no and my husband had to kick out my mom out of our house.
My husband is very relieved that I have ended contact with my parents and don't babysit my sisters anymore. He's an amazing father and supports me a lot because he knows that ending contact wasn't something I really wanted. I'm not planning to NEVER have contact with my parents again, but I need some peace and quiet at least until the end of this year.
Again, thanks for all of the advice! I'll make sure that my sister 8F will get the help that she needs, but now I need to focus on my own baby. :)
TL;DR: I'm not babysitting my sisters anymore.


Source.