A sibling is the only opponent who will also hide the evidence for you.

Sibling relationships run two contradictory programs at once. You compete, you irritate each other, you keep score over things nobody outside the house would understand, and underneath all of it sits a loyalty that does not have to be requested. The rivalry is loud and the loyalty is quiet, which makes it easy to believe only the rivalry is real.

If you have one, say something to them this week that is not a joke or a complaint. If the relationship has gone cold, a short message about something you both remember is usually easier to send than you expect.