Mary was born in Molong NSW on 26/05/1879.
She married to William Cooper O’Brien in Croydon QLD on 01/02/1905. William was born in Brisbane on 24/06/1880.
They had the following children:
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Stephen Eric O’Brien (1906 – 1999)
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Edward O’Brien (1908 – 1908)
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Elsie Clare O’Brien (1910 – 1937)
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Estelle Edna O’Brien (1913 – 1945)
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Winnifred Dorothy O’Brien (1916 – 1941)
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William Cooper O’Brien (1919 – 1972)
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Douglas Alister O’Brien (1924 – 2006)
Mary died in Rockhampton on 12/07/1940.
William also died in Rockhampton but on 09/06/1959.
Both are buried at Norman Gardens, Rockhampton Region, Queensland.
Stephen Eric O’Brien (1906 – 1999)
Stephen was born in Normanton NT (registered in Queensland) on 19/06/1906.
He married to Wilhelmina Gwendoline Andresen in QLD on 11/12/1933. Wilhemina was born in Brisbane on 13/03/1913.
They had 1 daughter:
- Jill O’Brien
The marriage ended in divorce and Stephen married in about 1956 to Sybil Lilian Currey. Sybil was born in about 1928 in Fisher QLD.
They had 1 daughter:
- Elizabeth Ross O’Brien
Stephen died in Sandgate Brisbane on 28/08/1999.
Wilhelmina died in Ipswich on 04/03/2011.
Edward O’Brien (1908 – 1908)
Edward was born and died on 01/10/1908 in Queensland.
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Elsie Claire O’Brien (1910 – 1937)
Elsie was born on 13/08/1910 in Queensland.
She died on 11/07/1937 in Queensland.
Estelle Edna O’Brien (1913 – 1945)
Estelle was born on 03/03/1913 in QLD.
She died on 18/05/1945 in QLD, unmarried.
Winnifred Dorothy O’Brien (1915 – 1941)
Winnifred was born on 03/08/1915.
She died on 05/03/1941 in Goodna QLD.
William Cooper O’Brien (1919 – 1972)
He married to Gwendoline Graham Shanks on 28/07/1943. Gwen was born in Charters Tower on 21/07/1922.

Gwendoline (L) and her sister Iris (R) Shanks.
William and Gwen had 3 children:
- Wendy O’Brien
- Carol O’Brien
- Glen O’Brien
William died on 15/08/1972 in Brisbane.
Gwen died in Rockhampton on 05/03/2012.
Douglas Alister O’Brien (1924 – 2006)
Douglas was born on 02/06/1924 in Emerald.
He married to Dulcie Letitia Graham on 10/03/1951 in Mount Larcom QLD.
Dulcie was born on 11/06/1927 in Gladstone Queensland.
They had 3 children:
- Graham Douglas O’Brien
- Judith Mary O’Brien
- Peter John O’Brien
Dulcie died on 24/01/2005 in Wishart, Queensland.
Douglas died on 11/12/2006 in Wishart.
Both are buried at Mt Thompson Memorial Gardens, Brisbane, Queensland, Australia