Am I doing right or wrong ?

My mother in law asked us for help ... to help her out take care of my bf sister kids she has a 2 month old a 4 year old and a 9 year old she got kicked out of the house bc she has contently been leaving her kids for 4 days to a week alone ... and dose drugs we use to live with them but got our own place Bc I couldn’t live with his family I have a 1 year old and he has a 5 year old we see her often so I’ll be taking care of 5 kids but the thing is we been struggling in our new home but we feel comfortable it’s peaceful and calm but then my mother in law said we can move in pay no rent and take care of the kids when we were able too and I was like okay but then she brings up my miscarriage that happened 2 weeks ago talking about if my daughter doesn’t want her baby here this is your baby you adopt him your his mom god does things for a reason you went thru a hard time and my daughter doesn’t want this baby if you and my son don’t want to pay rent the room is there if you take care of this baby and clean after the girls and us ...that thru me off I have a 1 year old that needs as well my attention I work night shifts and as well my mother in law but the baby doesn’t sleep at nights she wants me to come home and take him to my room I would have sleepless nights and still be able to care for my daughter I honestly feel like she wants me to drop my priority’s and if I don’t we can’t have the room unless we pay rent idk what do I wanna be able to give more to my daughter but then idk if I’m being selfish or rude if I say I don’t want too take care of the baby and the girls there not my responsibility 😔😔😔