The soldier was Andrew Kenny - in 1911 he has given his age as 27 - so an approx. birth year of c.1884.
I haven't found him on the England 1901 census - nor the Irish one with certainty. He is in Blackburn in 1911, but by the time he was killed in WW1, his wife is in Darwen.
From Lancs BMD Andrew Kenny married Sarah McGee in a Registrar attended marriage in 1908 - in Blackburn.
I don't want anyone to go to any trouble - I was just trying to find his birth in Ireland - but couldn't make out the place name.
If necessary the marriage certificate can be obtained to discover Andrew's father's name.
The marriage to Sarah McGee is on Lancashire OPC - "Registrar Attended" usually means it was in a non-conformist or RC church, so there's a reasonable chance of finding the register or a transcript online. It was at St Joseph's Darwen, on 24 Oct 1908.
However, at this marriage Andrew's father is given as James rather than Patrick. Also, I haven't checked the CWGC entry, but if they give a father's name rather than a wife, that can be a fairly strong indication that he wasn't married.