Hi Jan! Thankyou so much for your help, that is definately the person i am after. I believe he is still alive in Penrith Sydney, he goes by Jack /Jacob /Johannes Gerritt Rikkerink.
He is my partners estranged Grandfather.
The info i have is dob: 26 sep 1944 - The Hagus, HOLLAND
Only one child, yvonne as far as i am aware with first wife Suzanne Boyne
He immigrated in 1963 naturalized in 1976 after serving as a lance corporal in 1970-71 for australia in vietnam. (Which made reentry to aus after the war difficult)
i dont have parents names. Does that info help?
Kindest regards, Rachel