Sean Ono Lennon reposted a message on his Instagram Stories Monday that seemingly shut down rumors of tension between Sean, 49, and his half-brother Julian Lennon, 62.

Julien’s Auctions announced Tuesday, April 23 that Lennon’s Framus 12-string Hootenanny acoustic guitar, which he played on classics like “Help!,” “You’ve Got to Hide Your Love Away,” “It’s Only Love, ...