He was the son of Isabella C Stewart.
In 1901, Isabella and her son, James were living with her family (Crawford) in house 2, Rossnagillagh, Glendermot, Co. Londonderry. James (8) is described as a scholar.
In 1911, Isabella is residing in house 6, Claredon Street, Londonderry. This later was known as 11 Clarendon Street, Londonderry, There is no mention of James in this home on Census day.
The 1911 Irish Census records a Londonderry man, James Stewart (18) boarding in house 34, Eblana Street, Cromac, Belfast. His occupation is recorded as Bank Clerk.
Stewart served with the Royal Field Artillery and attained the rank of Lieutenant with effect from 4th February 1918.
The National Archives records a Medal Index Card as follows:
Royal Irish Rifles, 40921, Private
Royal Field Artillery, 2nd Lieutenant
Royal Field Artillery, Lieutenant