We recently had a family living with us for over two years; two were older teenagers. Actually, after a few months three of them went on to other places, but the mother and youngest teenager stayed on. At the start, the father, a friend and long-time on and off employee and/or "handyman", who also helped me care for my husband for his long and final illness, spent a couple of months fixing up things to accommodate so many people, getting extra furniture, etc. We obviously needed more dining chairs, and he found some very cheap used ones, that we decided were unsatisfactory but would do for a while. The big surprise was that although he, and usually his wife, would eat at the table, everyone else took their food to their rooms to eat by themselves.
I've see this in other households, and to me it seems to be a
very unhealthy habit. Unless there is a party or celebration, most kids
and many times adults, are in the habit of eating by themselves.