She has not been clinically diagnosed with dementia, she seems to had blocked her memory since the passing of my father. But when i mentioned she had her own home, she started asking details, the thing is that while she lived with my abusive sister, my sister added her name to mom's deed and started renting mom's home. She collects rent & thinks I don't know this. Now I have my mom & my DS brother living with me, now my mom keeps telling me on a daily basis to sale the home & use the funds for my caregiving of her & my brother. If I did this I am afraid her medicaid, medicare & SSI benefits will be compromised. Has anyone ever gone through something similar & what would be the outcome? I have other siblings who have had it bad financially & would be mad if I did sale, been that I have no need financially they would be outraged. I informed them that Mom & brother are now living with me & not one of them has been here to assist me with their support, I brought them out severely malnourished, abused & exploited, my husband has been wonderful buying them all their clothing, feeding them & raising up their morale after 7 years of captivity in my alcoholic sister home.
If the transfer to your sister was legitimate, and your mother has no remaining interest, then you can't act on her behalf to sell the house which your sister might actually own.
As CWillie advises, you need legal assistance to get to the bottom of the issues before even considering sale of the house and resentment of other siblings.
If your sister falsified a deed, it's grounds for charges of elder abuse.
However, given that your mother is a confused, you're going to have to do some digging to find out what really happened.
Get a copy of the deed from the local Register of Deeds for the county in which the house is located. If your mother conveyed the house to your sister, you'd have to prove that either her signature is false, that undue influence was exercised, or something else nefarious was occurring.
Did your mother execute a POA authorizing you to handle her financial and legal affairs? If not, depending on the state of her memory, you might not have authority to sell the house anyway.
But you need to start at the beginning to determine what really happened with the conveyance for the house.
That's what an attorney will do, so you can save yourself a bit of money by starting the investigation first. If there was abuse, undue influence, misrepresentation or similar inappropriate activity involved in the transfer, you really will need legal assistance to rectify the damage done.
All of this needs to be addressed before even considering sale of the house.
And, not to be cruel, but the poor relationship with siblings isn't something you should raise with an attorney. An attorney isn't going to want to hear about family friction. It only diverts attention from the underlying legal issues.