:? I need some helpful advice regarding how to deal with 22yr old stepson. His father and I got married almost a year ago and they moved in with me in my house. I have two sons of my own a 19yr old and a 16 yr old. I allowed the 22yr old to move in my upstairs space which is about 900 sq ft. to himself with the intentions that if my boys need to go up there they could considering he would have his own private bedroom and bath to himself along with the bonus living room to be used as a common place. At first everything was great but now after 9 mos. I feel like it is going to pot!