I haven't read all of these entries (I will return because the subject interests me). Adults who move back into their parents' home (or a friend's home, or other relatives) should be expected to live by the rules of that home, period. If you allow otherwise, you're teaching (and yes, you are still teaching) that you don't deserve respect. Because of our military lifestyle, we have often lived with others for a week here or there. The couple of times it happened to be my parents, we:
Bought half the food.
I cooked many, if not most, of the meals.
Paid half the utilities, all of our own phone calls
I don't have brothers, so my husband has acted as if he was my father's son and done any "guy" type chores he needed help with
Treated our parents to dinners out.
Not only did our own laundry, but did the laundry of our host/parents. As in "Hey, Mom, I'm washing whites. What do you want to toss in?"
I've done this since day one whenever I happened to spend more than a couple of days with my parents or with other friends. A lot of parents tend to think they are doing something by not expecting their adult kids to help out, in hopes that the kids will be saving the money they are saving by living with them. I look at my friends, and their kids do NOT save that money.
Many friends have learned the hard way that it is much better to expect more out of their kids rather than less. A lot of kids live up -- or down -- to your expectations.