New York. My sister-in-law, widowed, with children, lives with my mother in mother's house. No rental agreement. Mother's will entitles her to my deceased brother's share of estate. When mom passes, SIL wants to buy house & expects a discounted price. What complications might we face if she does or does not buy the house? She disagrees with us (remaining brothers) on value of house. Expect it will be hard to settle with her or get her to move out if we sell to others. Will indicates that executor (another brother) will decide how to handle her share. Can she fight in court to hold onto the house? Can she legally stay in the house in order to delay/complicate settlement, even if sell the house on open market? Is a living trust best protection?