What should I do? Should I move away or take it?

I have been having family relationship problems for many years. It is becoming intolerable for me to have to continue to argue and debate my family. It upsets me that my sister/brother allows their child to be disrespectful and rude to me. They make excuses for their behavior and my nephew/niece can talk like this too me without any discipline as my sister/brother gets satisfaction seeing me upset. I have adult children who just pretend I am not here and I barely get to see my grandchildren. Part of me wants to leave and just run away. I just don't want to regret something else, which may not be possible being that I tend to get blamed anyhow for everything. I am fearful for leaving away for good, because I worry that my grand kids will hold it against me for leaving. What if they need me? What should I do? How much longer must I tolerate this family who can not stand me. They ration the water I use, in the hopes they somehow get me to pay them more money for living here. They know I am disabled and they don't care. They know I have no where to go except by myself and If I leave I don't even want to talk to them again.