Hi - Does his passenger record, or U.S. records, give his place of birth as IoM? Could you give exact details of these?
I couldn't see an obvious entry for the family on the 1891 census index.

There are marriage transcripts on a Rootsweb site which include:

012961-1909 (Leeds Co) William Seymour CLUCAS (?) 21, Barber, of Brockville, s/o James CLUCAS (?), Yeoman, & Jane McCORD, married Emily Ruth McDONALD, 18, of Brockville, d/o John McDONALD, Carpenter, & Estella FITCH, witn: Elizabeth H. REYNOLDS, L.E. Maud REYNOLDS, Brockville. 5 Jan 1909 Brockville.
At: homepages.rootsweb.ancestry.com/~maryc/leeds09.htm

Sue