Feeling better

I'm feeling better today.  I've decided to move in with my father, but to do away with anything legal that would make me co-owner of the house.  That way I can move out at a moments notice.  If I end up moving out, that's it.  There's no going back.  I'll have to deal with whatever he needs from a distance.
For years I've had friends ask me what's it like being an only child?  Some ask because they're considering having only one child.  Well, I've always told them that it's fine when you're young.  But later, when your parents grow old, there's only you to help them.  I moved in back when my mother was dying.  I stayed there for ten years.  It wasn't easy, but in the end I was glad I was there.  She died of congestive heart failure and my father couldn't have handled it alone.  Plus, it gave me time to spend with her that I wouldn't have had.
Now, I'm back to moving in again.  I hate having to do it, but the alternative is so much worse. 
 
Thanks everyone for talking me through this.  I might be moving in, but I now have an escape hatch in case things don't go well.  It gives me comfort.