Certainly some interesting reading with the Petition file. Im now thinking that his wife Mary Ann (My grandmother was known as Anne or Annie nee Morrison) did not come to Australia and he has infact remarried.
I can find no info on their marriage or her arrival in Australia.
Roberts Son, Robert H Mason appears to have his mother living with them on the 1871 Census.
When Anne died in 1910, her death certificate states she had 6 children, 2 female and 4 male. I can only trace 3 of the children 2 girls (One my 2x grandmother) and the some who died at 4 months old.
Interesting how a small piece of information leads to lots more questions and mysteries.