Just to add another child to the family, Carl Mononona? HAYWARD born 1886 or 1887. Various spellings of his middle name include Monanioa, Manonia, Monanona, Mononona.
Next-of-kin in his 1916 Attestation paper is his brother, W G HAYWARD of 398 Pape Ave Toronto (same name and address as Alvin's next-of-kin).
http://www.collectionscanada.gc.ca/databases/cef/001042-119....Alvin HAYWARD
http://www.collectionscanada.gc.ca/databases/cef/001042-119....Corporal Carl Monanona HAYWARD
http://www.canadiangreatwarproject.com/searches/soldierDetai... "Married Cathrine Annie NORMAN at Princeton, British Columbia on July 22, 1916. Died at Williams Lake, British Columbia on February 21, 1964."
1916 Marriage - Carl lists his mother's name as "Mary".
http://search-collections.royalbcmuseum.bc.ca/images/getimag...1964 Death Registration for Carl HAYWARD.
http://search-collections.royalbcmuseum.bc.ca/images/getimag...1965 Death Reg. for Catherine HAYWARD, informant is son E S HAYWARD.
http://search-collections.royalbcmuseum.bc.ca/images/getimag...