Sandra said:
A Canadian Passenger List had a Frank Lambert. Born 1897 and aged 16 years
Port of Departure: Liverpool, England to Halifax. Nova Scotia, arriving 9 June 1913 on the Mongolian.
This was a group of children c/o the Middlemore Home.
The Middlemore Home was in Birminghamhttp://www.nationalarchives.gov.uk/nra/searches/subjectView.asp?ID=O26369Everybody else may have figured this out, but it sounds like:
Frank went to Canada as a Home Child.
He was in England as a member of the Canadian military in WWI and married Ethel there.
He returned to Canada with the military, so doesn't show on passenger lists.
(edit re polarbear's post below -- oops, I just assumed he'd been looked for and not found!)
Ethel had son Ronald in England and then travelled to Canada to join Frank.
There are two Frank Lamberts in Home Child records:
http://www.collectionscanada.gc.ca/databases/home-children/001015-100.01-e.phpFrank Lambert aged 19 arrived in 1911 (so he was born c1892), departing Glasgow 17 Jun 1911, "Domestics & Labourers", destination various locations
Frank Lambert aged 16 arrived in 1913 (so he was born c1897), departing Liverpool 27 May 1913, Middlemore Homes, destination Halifax
From the CEF papers, ours appears to be the younger one.
edit - it does show that not all Home Children lived lives of quiet desperation in Canada. Some chose to come back here after WWI, for example, and prospered (my mother's aunt's husband was another example of that).