According to our Parenting Plan, all three boys are supposed to go back to MomC's on Sunday evening. The past Sunday Oldest Son stayed at our house so that he could work on homework. The semester ends this week and he is perilously close to failing biology and geometry.
Youngest Son asked me after dinner who was going back to mom's. I told him that he and Middle Son were going, and Oldest was not. He said he was glad that Oldest was staying because at mom's house "we argue all the time."
Which is very interesting to me. They rarely argue at my house.