The 1901 Census Ireland records John Brennan, a retired farmer, of Granard, Co. Longford living in St. Ignatius Road, Inn's Quay, Dublin. He was living with his wife Marcella and his children;
Thomas 28 Tram Conducter
Michael 22 Tram Conductor
Joseph 15 Clerk Post Office
Cornelius F. 13
Margaret M. 11
All of them are recorded as having been born in the Parish of Granard, Co. Longford. The townland is transcribed as Killatona or Kilratona however a quick search reveals no such townland in Longford. The nearest match is the townland of Killasona and is also a possible match for the handwritten Census return! (A timely reminder to self to always check the original document where possible!) It is unusual to see a townland recorded on the Census so I am imagining that John was proud of his homeplace, and very sad to leave it.
By 1911, Marcella Brennan was a Widow and the Head of Household. She was living with her son Joseph, a postman and her daughter Maggie, a dressmaker. Marcella Brennan is recorded as 36 years married and the mother of 15 children of whom 14 are still living in 1911.
I cannot find Michael, Thomas or Cornelius Brennan in the 1911 Census on the first search though this does not mean they aren't there. They may have been recorded by a nickname!
As we draw near to the Centenary, I wonder if Joseph was in the G.P.O. at the time of the Rising.