He was the son of Dora Jane Cooke.
In 1901, a Dora Cooke was a visitor to house 101, Brighton Road, Rathmines, Dublin. In the same year, John Anthony Cooke is living alone in house 49.3, Pollbwee, Navan, Co. Meath. His occupation is that of Bank Accountant. By 1911, Cooke was again living with his mother and family in house 6, The Allies, Fair Gate, Co. Louth. He is described as a Bank Cashier from Dublin City.
The National Archives records a Medal Index Card as follows:
Royal Irish Fusilers, 2nd Lieutenant
Royal Irish Fusiliers, Captain
The Belfast Banking Company 'Roll of Honour' booklet records Cooke' last known address as 'being in hospital'.