I live in Sydney, and my Great Grandfather was a Thomas Breen, born C. Kerry around 1839. He was a policeman with the Irish Constabulary, emigrated to Australia probably in the 1860s, joined the New South Wales Mounted Police, married in Australia Mary Emily Doolan, and became the first Mayor of a country town here called Gunnedah, where my grandfather Thomas was born in 1879. Her family came from Rosscommon. Seeking details of both families.
Any help appreciated