I found the following on one of their children.
LESLIE CLEGG McMURDO
Leslie was born in Stockton in 1900 to Thomas and Beatrice McMurdo. The family lived at Howden Street but while Leslie was still a boy the family emigrated to Durban, South Africa.
When he was 16 Leslie attempted to join the South African Army but was refused enlistment as he was still at school. so he ran away from home and stowed aboard a ship bound for Australia where he applied to enlist with the Australian Imperial Force.
In his application to the recruiting office at Townsville, Queensland, he declared his year of birth as 1898 to overcome his underage status. Additionally it would seem that he recorded on his application that he had already completed 121 days basic training with the Durban Light Infantry Regiment (South African Army ) prior to leaving South Africa, presumably to reinforce his age eligibility.
He was allowed to join the Australian Infantry, 31st. Battalion , AIF (Private 4563) 5th. Australian Division at Townsville, Queensland on 21 September 1916. On 23 December he embarked on the HMTA "Demosthenes " at Sydney, disembarking at Plymouth on 23rd March 1917. He left Southampton for the front on 30 July and after reaching Harve on the 4 August 1917 was taken "on strength " ( 12th. Rifle Company, 31st. Battalion ) on 24 August 1917.
Just over a month later on 26 September 1917, south of the village of Zonnebeke, Belgium, Leslie was carrying a wounded comrade back to Allied lines when he was shot by a German sniper and killed.
He was posthumously awarded three service medals: the British War Medal, Victory Medal and the 1914-1918 Star andis buried at Buttes New British Cemetery, Polygon Wood, grave reference XXIV. D.