How should we parent a grown child when there are also two younger children in the home? We have three kids altogether: a boy and a girl who are still in high school, and an older son in his mid-20s. The oldest has had some tough luck recently and needs to move back home for a while. We realize that he’s an adult and that we’ll have to treat him differently in terms of rules and expectations, but we’re concerned about the effect this might have on his younger brother and sister. Do you have any advice?