What is the source for Charles Reynolds, {Australian Immigrant} born 1812 USA died 1885 Australia being the son of John Randall and Sophia Susan Randall

What is the source for Charles Reynolds, {Australian Immigrant} born 1812 USA died 1885 Australia being the son of John Randall and Sophia Susan Randall
What is the evidence that John Randall arrived in Australia as a convict on Atlas in 1788?
When and where did he marry Sophia?
If he arrived in Australia in 1788 how did he father a child born in USA in 1812?