[1] He was brought up in Cappoquin, County Waterford, Ireland, he later moved to Clontarf, Dublin where he became a civil servant.

He married Margaret McGuire a teacher from County Leitrim in 1912, with whom he had eight children, including Colm Condon, who went on to become a barrister, and Attorney General of Ireland.

Thomas and Margaret later moved to Ashbourne, County Meath where they brought up their children.

Condon was a member of the Irish Volunteers, who took part in the raid of the Royal Irish Constabulary barracks in Ashbourne, led by Thomas Ashe, in the Easter Rising of 1916, and was subsequently sent to HM Prison Wandsworth on 8 May 1916.

[7] He was disqualified from the Seanad on 25 October 1944 by virtue of his membership of the Irish Tourist Board.