Parent's live with me, daughter to get house if I die. How can I keep her from evicting my parents if I die before them?

I recently purchased a home (I am the sole homeowner) and my parents moved in with me. My will is currently set up so that my only child inherits everything upon my death. We are in the middle of an extremely nasty custody situation, and I want to protect my parents in the event that I should precede them in death. If I should die, then he would force the eviction of my parents either directly or through coercion as he has sole physical custody of our young daughter. I also want to protect the home as an asset and keep it from consideration if either or both of my parents would require nursing home care. What options do I have to protect their right to remain in the home while they are able while protecting my daughter's right to the home.