Anyone can sue anyone else for anything. The better question is "Can she succeed in her suit?" The answer may be yes, if you violated the terms of your father's will or trust as it relates to her and her need for housing. However, if your father's trust left the house to you and your sister outright without any provisions for your stepmother, you should be able to do with it as you wish.
Answered on Dec 20th, 2013 at 7:44 PM