My husband and I are going to be the only inheritants on an elderly friends will. Her house and all belongings are to be ours at the time of her death. Her Sister, who is well off, has made a statement that she can contest the will, is this possible? Also our friends nephew has asked if he can move in with our elderly friend until he can find a place and she has agreed. Will this nephew have squatters rights to the property if he is still there at the time of her death even tho the will states my husband and I are the only beneficiares on the will?