If you enquire on the passenger list 1865/1935 Canadian Genealogy Centre then search the name William Henry Sharpe you will find 5 such names. Choose the one with a date of birth June 7 1896 it matches the birth in Brian Lawson's Index for William Henry Ches(t)worth.
The document you will see is the attestation paper for William on his embarkation Nov. 5 1914 with the Canadian Expeditionary Force.
Among the details :-
William Henry Sharpe, born Ramsey I.O.Man
Father W H Sharpe King Street Ramsey
Date of Birth June 7 1896
Occupation Farmer
Single
Height 5ft 3in
Complexion fair
Eyes brown
Scars on upper lip, forehead and right arm.
This was the boy who went to Birkenhead and may be with Mary's brother John?
Len Faragher
Len Faragher