William, the only surviving son of William Cook and Catherine Serpell, was born c.1829 in Morval, Cornwall.
He lived his whole life in Antony, Torpoint, working as an agricultural labourer.
On 1 September 1850, he married Ann Cowl. They had at least 11 children.
Since Cook is a common surname, his date of death is as yet unknown. However, it is thought to have been sometime between 1891 and 1901 as he does not appear on the latter census.