Dh and I have always had places we sit, I sit on one end of a massive corner sofa and he sits in the middle where it makes an L and that been the way for years.
Adult DS moved back home recently after living with a partner for 7 years (longer than we've lived in this house or had this sofa) and sits in my seat, I used to ask him to move up but he seems to like that seat (as I do ) because there's a table and charging port so argues he can sit there if nobody's in it.
But even if I'm not in it I'm only up for a minute pottering about and then he's in my seat again.
AIBU do other people have their seats in the house or am I selfish as he pays his way and it should be first come first serve?