Syd Cameron was married in 1914 to my father's aunt Bertha Thompson ( daughter of Syver (or Sever) Thompson (or Thorson) and Emma Johnson). She was born in 1895 in the Spruce Valley area of Minnesota. All I know is that he was killed when a shotgun accidentally went off. My father knew him. Bertha later married Malcolm McKinnon in 1928. She and her brother Syver were the last 2 remaining members of that generation of Thompsons and lived in the Langley, BC area. They passed awayseveral years ago.
Besides the 2 sons you mentioned, she had a son "Snooky" - I don't know his true given name and I don't know if he was a Cameron or McKinnon. He also lived in the Surrey/Langley area. He died a few years ago. I hope this is of some help. How are you related to Mr. Cameron?