We have been taking care of his grandmother for the last 2 years. She has dementia and is also an amputee. We get no help and we both work full time jobs. We actually moved in to her home to help her but we have just had our fill and think it is another family members turn. She has 3 children that live in the same town as her and another who lives 3 hours away, we get absolutely no help, we can't go out on dates or go away for a weekend without having to bring her or only going away for a few hours. Our name is not on anything and we do not get paid, would we be held liable if we told other family members we were moving back to our home and someone else had to take care of her?
Time for a family meeting (plan on it getting hot and some angry word spoken). In fact, it wouldn't hurt to get a disinterested 3rd party to step in and correlate the discussion--but I don't know how you'd facilitate that!
Minimally, make a detailed LIST of the things you want to discuss. Make it a roundtable discussion. Let each person talk for 5 minutes. Then move on.
Maybe, and that's a HUGE maybe, you can work things out with a minimum of fuss. But plan on it getting ugly. I don't know your family's dynamics.
You are NOT financially, emotionally or physically responsible to continue to care for Gma.
I wish you all the luck in the world. My 2 attempts at this (simply getting paid help for mother twice a week) resulted in our family fracturing into 6 separate segments. I have not spoken to the brother who has mother 'captive' for over 2 years.