My G-G-Grandmother was Emma Jane Vivian who married Francis Green Ford in 1871 in St Austell. EJ & FG Ford left St Austell on 26January1878 on the ship "Clyde" and arrived in Adelaide, South Australia. They settled in Burra (Aberdeen)where (I believe) both died c1927, thankfully not before raising the family that eventually produced me.
Little seems to be known about Mary Creba. I'll have a look at the Calstock site(s) and see what I can find there. ..... the search goes on ;-)