Private Sealey married Mildred Mary Fisher at St Joseph’s Church, Avon Dassett on 8th May 1915. Before enlisting he was a chauffeur. The family moved to Kildare where their first son Charles was born on 4th February 1916.

Private Sealey enlisted, aged 23, in the field from the British Red Cross Society to the Army Service Corps and was posted to France with the British Expeditionary Force as an ambulance driver.