John Brennan was born 17 May 1876, son of Martin & Catherine (née Canavan) Brennan at the village of Develeash which in Irish is An Dubh Lois, meaning ‘The Black Fort’. The family farm (shown above) is a short distance from Kiltimagh, Co. Mayo, Ireland.
John Brennan married Margaret Moran (born on 25 December 1886) daughter of Patrick & Catherine (née Stanton) Moran. They subsequently had nine children:
- Kitty, born 8 Feb 1911
- Mary, born 12 Apr 1912
- Martin, born 8 Dec 1914
- John, born 12 May 1915
- Bridget, born 21 Apr 1917
- Margaret, born 2 Aug 1919
- Winifred, born 21 Jul 1920
- Michael, born 8 Sep 1924
- Thomas, born 2 Dec 1927