PLEASE HELP IDK WHAT TO DO!

Me and my husband have been married for four years and my mother and my little sister has lived with us for majority of that time. Two weeks ago my husband and I decided we are moving and we do not want my mother to move with us so we told her she had three weeks to find another place to live. She is a drug addict and has burned every bridge she has so no one wants her to live with them. I've put up with her crap for four years and I don't blame them! I let her move in under the condition she babysat my kids while I find a job and work and she agreed. Every single time I've asked her to watch them she has told me no and came up with some excuse why she can't. She stays gone all day and all night and leaves my little sister with me and just expects me to pay for her to eat and watch her. When she does come home it's like three o'clock in the morning and she beats on the door until I let her in. I told her that I will definitely still allow my little sister to live with me but she won't allow it. She is using my little sister as a pawn so she will have a place to stay and it's honestly pathetic. I feel so damn bad that my little sister could be homless but I am so sick and tired of my mother having no responsibility. She has always lived off people and used my sister so people will feel bad for her and let her live with them and I just can't allow it anymore. I have stayed up several nights feeling so guilty about it...I have prayed to God and asked for a sign that I'm making the right decision. My husband is the one with the job and he's tired of having to take care of my mother and I can't make him take care of her any longer. Please someone give me advice. Am I making the right decision? My mother has bothered me every single day since I told her that she needs to find a home saying she's called around and can't find anywhere. My older sister will also not allow my mother to live with her for the same reasons I won't. I just feel everyone expects me to take care of them but I can't make my husband take care of my grown mother anymore...I just can't.