Hello Jackie,
I was browsing on line when I came across your post. Sydney Frederick Wilson was my great uncle, my Paternal Grandfather Charles Henri Wilson’s brother. Of course your post is a while ago so maybe you now have an answer to your inquiry, It took me years to unravel a very complicated family story (mostly pre internet). You are welcome to contact me if you want I’d be happy to help! I I was wondering which one of Sydney’s children is your grandparent?