What is next?

My Mother is 95,had a stroke and is wheelchair bound and housebound.My oldest sister lives with her and doesn't pay anything to live there.My middle sister has had cancer three times and in three different places.Enough she is in remission and catches everything that comes along.She won't help at all with my Mother.But she is well enough to do everything for both of her sons.One just got remarried and the other is alone.The youngest son has a new wife and four children between them.She does everything the youngest son wants her to do but she won't make time for her mother.My oldest sister is addicted to her cellphone.She does the least that she can do to help my mother and she doesn't clean the house.If my mother ask for something she fusses at her for bothering her on the phone.The two sisters are waiting for my mother to die for money.I am the one that takes care of her finances,keeping up with her medications,taking her to dr.appts.,buying groceries for her,doing cleaning for the areas of house my mother uses.I go over to my mother's house twice a week.My sister says she doesn't get enough help.I refuse to go over there more often if she is going to sit and look at that phone and do nothing.My Mother just got out of the hospital for a fungal ear infection and she is down to 97 pounds.She is weak as a kitten and my mother has to dress herself in the morning.my sister lies to my other sister and tells her she takes care of dressing my mother in the morning and my sister believes her.The only she does is fix her coffee,fixes her cereal,gives her her medication.She does put her to bed at night and does make sure she is comfortable.My sister is rude and hateful towards me.I stopped doing anything for her like I used to.Now I have to take my Mother every week to get her ear cleaned out to try to slow down the fungus.She had the same infection in July and it went away.She had scarlet fever when she was a child and she has a hole in her ear drum.I thought putting her in the hospital would have gotten rid of it.She does take a strong anti fungal twice a day since being released from the hopsital.She told me yesterday she wants to die.She hasn't had a n appetite since about 8 years ago.She wants to be with my father in heaven.She is miserable because she can't do anything for herself except feed herslef.She does drink two boost a day for nutrients.I am at my wits end.She does have dementia.Her memory is really failing.My sisters don't want her in a nursing home because the government would get some money from sale of the house and her assets.I don't want to put in her a nursing home because of the help situation.I can't let her live with me because I have serious back problems and so does my husband.He may need back surgery soon.What do I do.