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For other uses, see O'Brien.

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

The O'Brien family tree can traced as far back as the Irish king Brian Boru. At some point the family emigrated to the United States of America. Sean Aloysius O'Brien was one of the earliest known members of that family, who lived in Pennsylvania in the United States of America in the late 19th and early 20th centuries. (DS9 episode: "Bar Association")

At least part of the O'Brien family relocated back to Ireland prior to the 24th century. 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 episodes: "Shadowplay", "Homefront")

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")

O'Brien Family Genealogy: ListEdit

Mirror Universe Family MembersEdit

Alternate Reality Family MembersEdit

O'Brien Family Genealogy: TreeEdit

Brian Boru (11th century)
 
Sean Aloysius O'Brien (19th century)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Sean & Michael's father
 
 
 
Sean & Michael's mother
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Sean O'Brien
 
Michael O'Brien
 
Megan O'Brien
 
Hiro Ishikawa
 
Keiko's mother
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cully O'Brien
 
Bill O'Brien
 
Miles O'Brien
 
Keiko Ishikawa
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Molly Miyaki Worf O'Brien
 
Kirayoshi O'Brien
 
 
 
 
 
 

O'Brien Family Genealogy: Gallery Edit