Husband wanted to move his daughters in

Me and my husband have 2 kids together. A toddler and 4 month old. My step daughters are 14 and 16. They don't really like me and never talk to me when they're here. They full on ignore anything I tell them. My husband wants to turn our family of 4 into a family of 6 because his ex moved in her boyfriend who is a convicted felon. He raped two 16 year old girls and went to prison for it. His ex is saying it was back in 2010 and it doesn't matter now and that he shouldn't be held for something he did close to 15 years ago. My husband is worried about his daughter's because their mom does this where she will always pick men over them. She left them for days to go away with a boyfriend and there's nothing that could be done because they're teenagers. He is planning to take her to court to try to get the kids back here. He's already getting them for the winter and he is going to try to not have to give them back. We've talked about it and I really don't know how I feel about it and he said he's going to do whatever he can to protect his girls regardless of my feelings. I just wanted some advice on this

@Perfect Misaligned do you feel better when you're disgusting to other women for fun?

@Mo they don't like me and I don't want to feel uncomfortable in my own home.