@garvey-- Given that the uncle is (or was) a long-time administrator at Harvard as well as an alum, a brief email to the student’s regional admission rep explaining the omission is a decent idea. Ultimately, unless the uncle is really a big cheese at Harvard (either through his work or through his wallet), this new information probably won’t move the needle for the applicant. However, in those rare “all things being equal” situations, it can’t hurt to have the connection in the student’s file. But note that when “legacy” status is discussed, it doesn’t typically include aunts and uncles. Even so, I still vote for sending the update.