Hi, Boirn 1897 . Do you know the names of the parents -Fathers name in Full - mothers namein full - including maiden name.
Not in 1911 Canada Census - he would be aprox 14 years old - Have you checked reversing names to Henry Matthew CAMPBELL
Have you searched other locations for Matthew Henry/ Henry Matthew CAMPBELL- perhaps at age 14 - he may be away from home - working
Have you searched Family Search Org - Online
https://familysearch.org/searchProvincial Archive - may hold information re births -
Govt of Ontario Vital Statistics Registry office - may hold the Registration of Birth -
PERHAPS - the Birth had not been Registered at the time -
There may be a Late Registration of Birth - filed - when Mathew Henry CAMPBELL - made application for his Govt .Old Age Pension
Married in 1974 - Registration of Marriage - Long Form Marriage Certificate
Will show age at the time of marriage - Names of both sets of parents - including maiden names of the mothers - [ if remembered]