I second what RY says. On a “practical level” one benefit of remaining connected to these children/young adults, is that dangerous use of drugs/suicide are less likely. So it’s a matter of life and death.
However, I don’t believe, and don’t think most Rabbis do, that literally EVERYTHING has to be allowed in ones’s own house to try to placate them. Of course, many factors including age play a role, and Rabbonim and experts must be consulted for guidance on an individual basis.