This living-with-a-parent thing is an easy criticism to make, but a total cheap shot. Maybe they support each other in many ways - financial, emotional, practical. He may be a great help and comfort to her, considering she is in her 70s. Maybe all they have is each other. I would rather live with my children as opposed to growing old and alone. There is a well known and prominent bass player on the west coast, many of you will know his name, an old old friend of mine, who lived with his mother his whole life, because of these reasons. No shame. She died a couple of years ago, now he is alone, but who cares, just mock the man, I guess, even though he plays his ass off and is successful beyond probably most of us. I won't name him, because not sure he could withstand the collective scorn /s. The kick-em-out-when-they're-18 philosophy does not pervade all cultures, nor should it.