Son of Catherine McCallum + Brian H. Brown

Hello there, just found this site as i am researching my family tree. i did not know my grandfather on my mothers side (though i've been told i resemble him in a lot of aspects)   if anyone has any information on the lineage (and i do apologize for such sparse information that i have) i would be grateful. my mother's name is Catherine Anne, born in Brampton, Ontarion Canada. she has a relateively large family (though not so large for a babyboomer) with brothers Ian, George (that i can recall) and sister Elizabeth. (there is one more brother whom last i heard was living out in western canada, but i cannot recall the name.) their Mother's name was Ruth (as far as i remember.)  sadly, i never knew my Grandfather as he died before i was born and i do not know his name. i think it would be nice to learn about him through the family tree in a way.   any hints on the McCallums of Ontario Canada that might get me a start?  she married Brian H. Brown (my Father) in the mid to late 60's