John Seton Hay

For 5 years I have been searching for the thread about my grandfather John Seton Hay born in 1889 in. Wadestown NZ The only info I have found is that he was in the First Reserves in WW1 as an employee of the Vacuum Oil company. My father Seton geoffrey hay was born in 1923 in St Kilda Victoria. In 1936 the family were in6th Ave Sangate. I can find no record of my father's birth (reference is made in his Airforce record) or my Grandfather or his marriage to Jessie May Ludlow. I have reached a dead end Anyone out there who can help? i am being consumed by the geanealogy pox.Marcii