Can I sue my sister-in-law for not taking care of their own mother?

My husband and I are living with my mother-in-law here in nj. My mother-in-law owns the 3 family house.My husband and I are living on the 2nd floor and she is staying on the first floor. My husband has 2 sisters. One of his sisters used to live where my mother-in-law is living right now, which is on the first floor. The third floor is vacant and this is where my mother-in-law used to stay until we asked my sister-in-law to leave so her mother can stay on the first floor. My husband told her sister and family that they can stay on the third floor but she refused to do that because at that time she had 2 hips replacement. My mother-in-law is 91 now had a stroke last year and is on the wheelchair for the rest of her life. We used to have 2 caregivers but now we could hardly afford a full-time caregiver. I work in the midnight shift and I ended up working as a full-time caregiver and the caregiver that we hired works only for 2 days a week because that is the only amount of money we could pay her. My 2 sister-in-laws never visited nor call their own mother to see how she is doing. I am exhausted right now because when I come home from work and I am the one in charge of the caregiving I still would not be able to sleep because I have to bring her to the bathroom and give her a whole body sponge bath since I can not give her a bath everyday because she weighs 50 pounds more than me. Aside from this I have to give her breakfast and wash her stuff that she used the night before. My husband works early morning and he does not come home the latest 4 p.m. I just do not know what to do anymore. I keep on fighting or having some arguments with my mother-in-law almost everyday now and I really do not want this to happen but ahe always starts it. I told my mother-in-law if I am the one taking care of her just be quiet because everytime she opens her mouth what comes out are all complaints. That I am doing everything wrong. Before I forget I had a tear on my left shoulder because of this and now it got worst and I have a frozen shoulder. My husband does not want to touch her to clean her up and that she only wants me to do it for her. My question is what is the advice you could give me regarding my sister-in-laws and can I sue them? .