Patrick Flanagan of Saw Mills, Mullingar. Died 29th June 1944 aged 67. Therefore born in 1877, making him 5 years older than Lawrence Denis Flanagan - so probably his older brother? I haven't fully worked out the exact relationships of some of these Flanagans to Kitty yet, but I'm working on the basis they are her mother's cousins.
U.S. Draft registration card for Lawrence D Flanagan, 1918