O'Brien family

The O'Brien family is a family of Humans originating from Ireland on Earth.

The earliest known O'Brien was Sean Aloysius O'Brien who lived in Pennsylvania in the United States of America in the 20th century. The O'Brien family tree can traced as far back as the Irish king Brian Boru. (DS9 episode: Bar Association)

The O'Brien family continued well into the 24th century when Michael O'Brien and his wife had three children including Miles O'Brien (DS9 episode: Shadowplay).

Miles O'Brien married Keiko Ishikawa the daughter of Hiro Ishikawa on October 24th, 2367 and the two had two children; Molly and Kirayoshi (TNG episodes: Data's Day & Disaster & DS9 episode: Body Parts).