My brother has a tendency towards long-form, interleaved email correspondence. The result is that every email thread I've ever had with him spins off into an ev

My brother has a tendency towards long-form, interleaved email correspondence. The result is that every email thread I've ever had with him spins off into an ever-increasing number of simultaneous discussions, all interleaved. We take longer and longer to reply to each other, until one of us just stops, and then it gets picked up again some months later.