Siblings can drive you crazy and still be the only people who remember your childhood the same way.

Family can be both at once, and the irritation is not evidence against the bond. Nobody else was in the house for the bad year, the inside jokes, the way your kitchen smelled. That shared record is not replaceable, and it is also why they can get under your skin faster than anyone: they have the whole archive and no filter.

Keep the long view on the days they are impossible. You do not have to like each other every month to be the two people who will remember all of it at forty. Ask them about something from back then this week and see how differently they remember it.