My mom was only supposed to live with us a few months; it has been three years. She is difficult and non-cooperative, and she has so much stuff that there is little room for us, our two teens and a toddler. She "doesn't want" to move, or let go of any possessions, and she is beginning to make poor safety decisions around the 3 year-old, making it so we have to watch her carefully. She is still driving and has her own car; we are beginning to wonder about that as well.
She has some property that she can't live on, and only about $100,000 total assets to take care of her for 20-30 more years. We are not dependent on her financially although we do want to spend our money on enjoying our own family life and give our kids a good start rather than support her in expensive assisted living. There is no other family to help.