Theodore Charles Alexander O’Brien1
Phoebe Alexandra Joy O’Brien1
W/Cdr. Brian O’Brien1 
He graduated from Dublin University, Dublin, County Dublin, Ireland, with a Bachelor of Medicine (M.B.)1 He graduated from Dublin University, Dublin, County Dublin, Ireland, in 1931 with a Bachelor of Surgery (B.Ch.)1 He graduated from London University, London, England, in 1933 with a Dilpoma of Public Health (D.P.H.)1 He gained the rank of Wing Commander in the Royal Canadian Air Force.1
Children of W/Cdr. Brian O’Brien and Dorothea Simms
- Deirdre O’Brien+2 b. 24 Jan 1940
- Colonel Brian Dermod O’Brien+2 b. 14 Jan 1942
- Dr. George Lucius O’Brien+2 b. 19 Sep 1944
- Ruth Brigid O’Brien2 b. 16 Jul 1946, d. 1990
John F A Simms1
Child of John F A Simms
- Dorothea Simms+2 d. 1980
Dorothea Simms1 
Lifford.1 She lived Combermore.1 Her married name became O’Brien.
Children of Dorothea Simms and W/Cdr. Brian O’Brien
- Deirdre O’Brien+2 b. 24 Jan 1940
- Colonel Brian Dermod O’Brien+2 b. 14 Jan 1942
- Dr. George Lucius O’Brien+2 b. 19 Sep 1944
- Ruth Brigid O’Brien2 b. 16 Jul 1946, d. 1990
Colonel Brian Dermod O’Brien1
He gained the rank of Colonel between 1959 and 1989 in the Royal Canadian Air Force, Medical British.1 He graduated from Queen’s University, Kingston, Ontario, CanadaG, in 1963 with a Bachelor of Science (B.Sc.)1 He graduated from Queen’s University, Kingston, Ontario, Canada, with a Doctor of Medicine (M.D.)1 He was appointed Fellow, Royal College of Physicians, London (F.R.C.P.) in 1978.1 He graduated from Dalhousie University, Halifax, Nova Scotia, CanadaG, in 1997 with a Master of Science (M.Sc.)1 He lived in 2003 at 5863 Macleod Drive, Halifax, Nova Scotia, CanadaG.1
Children of Colonel Brian Dermod O’Brien and Barbara Eileen Brennagh
- Brian David O’Brien+2 b. 1 Nov 1963
- Patrick John O’Brien+2 b. 28 Dec 1965
- Christopher Michael O’Brien2 b. 22 Apr 1969
- Katherine Jennifer Eileen O’Brien2 b. 12 Feb 1971
John Frederick Brennagh1
Child of John Frederick Brennagh
Barbara Eileen Brennagh1
From 1 May 1962, her married name became O’Brien.
Children of Barbara Eileen Brennagh and Colonel Brian Dermod O’Brien
- Brian David O’Brien+2 b. 1 Nov 1963
- Patrick John O’Brien+2 b. 28 Dec 1965
- Christopher Michael O’Brien2 b. 22 Apr 1969
- Katherine Jennifer Eileen O’Brien2 b. 12 Feb 1971
Brian David O’Brien1
He graduated from Mount St. Vincent University, Halifax, Nova Scotia, Canada, with a Bachelor of Arts (B.A.)1 He graduated from Mount St. Vincent University, Halifax, Nova Scotia, Canada, with a Bachelor of Education (B.Ed.)1
Children of Brian David O’Brien and Susan Anne Martin
- Christopher Keaton O’Brien2 b. 5 May 1989
- Eliot Mary Brennagh O’Brien2 b. 17 Apr 1992
