mom n sister plotting against my s/o

So I'm 24 on baby number 2. Me n s/o have a place together where not perfect but we make it work if I need anything honestly he's the only one that has my back n has been with me for 4-5 years...My sister is 22-/1 child n lives with her s/o n family. We were never close growing up even tho same parents idk y..... but When they get into it her first place to run is my place I don't mind much but I really like my space. Anyways her n our mother are plotting for us to find a place together like I'm leaving my S/O.. who said I was leaving my s/o ... who said that that's what I wanted to do?? It just really bothers me like wtf leave me n life alone