Alexander Lingard Pearson, Mr - Alexander Pearson

I am searching for my grandfather's descendants. My name is Shannon Bell I live in Edmonton, Alberta. My grandmother Edna Richardson met Alexander Pearson in Litton B.C. and they had two children together, Keith and Faye. Keith is my father. Alexander and my grandmother split up, she married James Douglas whom I thought was my biological grandfather but I recently learned that in fact a Alexander Pearson is my biological grandfather. My father is deceased now and my Aunt Faye has very little information. All I know is that he was older than my grandmother and was from South Africa. If you know any information I would really appreciate it. If I have the wrong Alexander Pearson sorry for bothering you.