Other articles where Sean Lennon is discussed: John Lennon: Life in New York City and death: they soon conceived a son, Sean, born on Lennon’s birthday in (In Lennon had a son, Julian, with Cynthia Lennon. Both his children became musicians.) Lennon retreated from music and became a reclusive househusband, leaving his business affairs to Ono. The details of this very private.