I realize this response is over a year late, but I thought I would reply anyway. I'm Wesley's youngest son.
My father kept his biological fathers name (Shambrook). Of the 3 boys, my dad is the only surviving child (79 years old).
When I was young, i spent most of my first summers at their house in sudbury.
I talked with my dad, but his memory is very limited in general, so he wasn't a lot of help. He did give me a photo album that of his family with notes in it, but I couldnt find any references to siblings or Wally (I didnt realize his name was George, we called him Grandpa Wally)