Bertrand family, Ontario, Canada

My Grandmother died before I could find out much about my Bertrand side of the family. I have no contact and little information to go on. Any help will be apreciated. My Dads name is James Ovide Bertrand born in 1955. He has a Brother Dave Bertrand who is a twin with Laura Bertrand. He also has another sister Silena(?spelling) Bertrand. Had lived mostly in the province of Ontario and not sure where my Aunts and Uncle were born, however my Dad was born in Cambell River BC. My Grandmothers name was Jean Bertrand and Im not sure what her maisen name was. She died in 1998 in Tobermory Ontario and was also buried there. Any help no matter how big or small will go along way. Thank you.