The life estate will remain so long as your father lives, whether he uses the place or not, but he should have the legal ability to release it if he wants to. Have you asked him?
If he is willing to release his life estate, consult a good real estate attorney about getting a proper release drawn up. Unless there is unusual language in the deed establishing the life estate, a release should be a simple and inexpensive procedure.
Answered on Apr 30th, 2012 at 10:02 AM