Almost 6 weeks pregnant and stressed to the max

I am a single mom of 6 and pregnant with the 7th baby my sister and I got into it and she hit me because I told her to go get her son some help because her 10 year old son touched my 9 year old daughter and she is so scared to tell me what he did to her anyways I gave her and her kids a place to live because I didn’t want them going in the system again my youngest son is 15 months old and she called him dumb because he is not walking which he will soon be walking because he stands up by himself I just want my sister to stay out of my life but I don’t want her kids going into the system I want my kids to have rules and they can’t because they see her kids getting away with everything

what should I do?