These are the deaths. The last four numbers are the year:

Registration Number / Last Name / Given Name(s) / Father's Given Name(s) / Mother's Given Name(s) / District / Purchase Certificate:

2650/1952 CORKILL THOMAS JOHN ROBERT BURNS HANNAH PETERSHAM Buy Now
833/1916 CORKILL JOHN JOHN ANNANDALE Buy Now
456/1940 CORKILL EDWARD JOHN JOHN AGNES BRIDGET ROCKDALE Buy Now
49149/1973 CORKILL JOHN GEORGE HENRY MARGARET GILGANDRA Buy Now
6923/1975 CORKILL FRANCIS JOHN FRANCIS PEACOCK FRANCES

12140/1888 CORKHILL JOHN AGE 60 YEARS DIED NEWCASTLE NEWCASTLE Buy Now
3195/1911 CORKHILL JOHN WILLIAM MARY A RYDE Buy Now
9569/1966 CORKHILL JOHN ALFRED JOHN JAMES EMMA ST LEONARDS Buy Now
32246/1966 CORKHILL JOHN JOHN JAMES EDITH ANN KATOOMBA Buy Now
24827/1945 CORKHILL JOHN WILLIAM ROBERT ELIZABETH CATHERINE GUNDAGAI Buy Now
25604/1975 CORKHILL JOHN JOSEPH ROBERT KATHERINE

The one who has his age given means that parents' details were not included.

I'd suggest that Anthony buy his marriage cert if he hasn't already done so.

Registration Number / Groom's Surname / Groom's Given Name(s) / Bride's Last Name at Time of Marriage / Bride's Given Name(s) / District * Purchase Certificate
1723/1864 / CORKILL / JOHN / SULLIVAN / BRIDGET AGNES / BRAIDWOOD

Sue