Looking for Pitmans IN Canada

I am looking for any decendants of my uncle who was Thomas Pitman and who emigrated to Vancouver( not sure if this is 100% correct) around 1920 with his wife Maisie and their 3 children. Maisie was formerly called Lynas.
My father Lawrence was around 9 at the time.
Thomas was the son of Margaret Pitman ( nee McMinn ) and Thomas Pitman who originally came form Somerset, but settled in Belfast. They were married around 1895. I am having problems with the Irish geneology as records were destroyed so it is very difficult and I keep drawing a blank.

Other siblings apart from my father who was the youngest are :- George, Annie, William, Percy, and Jessie.
I hope someone out there can help me.