- For other uses, see O'Brien.
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
- Brian Boru, 11th century king.
- Sean Aloysius O'Brien, 19th century miner.
- Sean O'Brien, An uncle of Miles O'Brien.
- Michael O'Brien, father of Miles O'Brien.
- Megan O'Brien, wife of Michael O'Brien.
- Cully O'Brien, son of Michael and Megan O'Brien.
- Bill O'Brien, son of Michael and Megan O'Brien.
- Miles O'Brien, 24th century Starfleet engineer, son of Michael and Megan O'Brien
- Keiko O'Brien, wife of Miles.
- Kira Nerys, surrogate mother of Kirayoshi.
Mirror Universe Family MembersEdit
- Miles O'Brien (mirror)
- Keiko Ishikawa (mirror), wife of Miles O'Brien (mirror).
Alternate Reality Family MembersEdit
- Rita Tannenbaum, alternate reality wife of Miles.
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|