Hello Debbie,
I have a little book on Canonba it has John Browns arrival as 1821. The book has 3 marriges for John Brown and list the children of each of the 3 marriages.
There is also a photo of John Brown , a photo of his headstone and a sketch of his homestead.
My 3x great grandmother was married to her first husband the same day as John Brown was to his second wife and he and his son John jnr were witnesses to the marriage.
hope this helps
Kristy