I was actually looking for any relatives or descendants of these persons. Now that I know more, I can look for those details. The new info has Peter Cosby Knowles was born in 1930 probably in Queensland and living in Winton, Queensland in 2003. His brother Michael Cosby Knowles was born in 1936 probably in Queensland and was living in Malvern, Victoria in 2003. Joan Cooke is no longer a big question.