Hi and welcome to this amazing group. I am descended from James Bowles and Elizabeth Barber’s daughter Jane who married Joseph Winnett. I did not have your John as a son of James and Elizabeth but it seems possible to me. They were married in 1812 and he was born 3 or 4 years later. The earliest child I had was William born 1820 who travelled to Australia and arrived 7 Jan 1840 aboard the Alfred. I have added your John to my tree so that I can do some research on him and determine how he might fit. But perhaps you can confirm which webpage you are referring to as the Bowles Silvermines site. I see you live in Warragul, so we are quite close as I am in Yarragon. If you would like to discuss further in person let me know and I will send you a personal message.