My parents are 75 and 78. For the past 1 1/2 yrs, my nephew has lived with them because of a situation that he will not live with his mother and can't live with his father. He is now 18 yrs old and is becoming more verbally abusive to my parents. I want to know if and how I can legally get him to move out. This situation is becoming more stressful for my parents and I am worried about their physical and mental health.