John Henry Cook was born in 1899 in Seaforth. He was the son of John Henry Cook and Eliza Cook.
1901 Census: 17 Parker Street, St. Margaret and St John, Westminster,  London - Parents with John H, and Edith J.
1911 Census: 478 Stanley road, Bootle - Parents with John Henry, Edith Josephine, Charles, Stanley, Irene May and Winifred 
He enlisted at Liverpool and was formerly in the King's Liverpool Regiment, service number 37711. He was killed in action on 25th April 1915
Reports on his death appeared in the Bootle Times on the 1st November 1918 and in the Liverpool Echo on the 31st October 1918. The photo that appeared in the Liverpool Echo report is reproduced here with the kind permission of the Liverpool Daily Post & Echo.
   Corporal John H. Cook, eldest son of Mr. and Mrs. J.H. Cook, of 478, Stanley-road, Bootle, has been killed in action. He joined the "Pals" in 1915, and served in Italy and France. He was a scholar at the Bootle Trade Preparatory School and Linacre School, and won three scholarships.

Bootle Times on the 1st November 1918

The Cook family were still living at 478 Stanley Road, Bootle after the war.