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Julian Lennon is his half-brother and Kyoko Chan Cox is his half-sister. On October 22 2011 Sean showed up on Wall Street with Rufus Wainwright and Josh Fox. The Ghost of a Saber Tooth Tiger
Kemp Muhl and Lennon premiered the band The Ghost of a Saber Tooth Tiger during a live performance at Radio City on Valentines Day 2008.
He is the only child of John Lennon and Yoko Ono making him the half-brother of Julian Lennon and Kyoko Chan Cox. His godfather is Sir Elton John.