Hi,
A few details that may be of help in researching further...
Were your parents married at Sydney, 1952?
What were John's age and place of birth as listed on his marriage certificate? His occupation and that of his father?
There is a NSW marriage reg. in 1918 between a John Anderson and an Ellena Taylor (??)
4908/1918 ANDERSON JOHN TAYLOR ELLENA CONDOBOLIN
Cheers, Anne