When my boyfriend moved in with me, his adult son came with him. Soon after, the adult son's girlfriend moved in also. Not too much longer after that we told them they really needed to get out on their own. Especially since they were expecting a child of their own now. Not to mention that his adult son had stolen from us/me and there was a lack of trust. At this time my boyfriend and I made an agreement that no adult child from either side would move back in. We talked that these people (ALL THE ADULT CHILDREN) needed to be responsible for themselves.