Doris, here's a marriage record for a William Whitmore who has parents with those names. Is your couple from Ontario? Have you created WikiTree ancestor profiles for them? Thanks!
"Ontario Marriages, 1869-1927," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:KZBZ-FKS : accessed 7 April 2016), William Whitmore in entry for William Whitmore and Rosa Mcilvenna, ; citing registration , , Lanark, Ontario, Canada, Archives of Ontario, Toronto; FHL microfilm 1,871,077.