Hello there and Welcome to Roots Chat

I have had no luck in finding much about the arrival or marriage etc
I would suggest to you that you get a copy of one of the chidrens's birth certificates
because you should find the following information on them
"Birth Certificates
Full name, sex, date and place of birth
Mother's details including full name and maiden name, age, occupation, place of birth
Father's details including full name, age, occupation, place of birth
Date and place of parent's marriage
Previous children of the relationship "
it will cost you about $30 from NSW BDM's
or around $15.00 if you use a transcription agent.
have found a Wilbert Frederick COX dying in 1972 reg no 69480 parents James and Ada (NSW)
so this could be Wilburt F Cocks?
kind regards Jenn