Who do you contact to find a relation who emigrated to Canada after 1st world w

Question:

Who do you contact to find a relation who emigrated to Canada after 1st world war,?

His name was George Brierley who went to Canada with his sister Edith just after the 1st WW, they were my Aunty and Uncle from my mothers side, I beleave they went to Alberta they will have died by now ,but I know they have family and I would like to make contact

Best Answer - Chosen by Asker: I would suggest taking a look for them at familysearch.org, and then searching, maybe posting, at the surname and place message boards at ancestry.com and rootsweb.com, maybe genforum.com.