Elwin was born on 15/11/1893 in Curra Creek, Wellington NSW.
He married to Jessica Ann McDonald in 1932 in North Sydney. Jessica was born in Mummel NSW on 18/07/1906.
They had the following children:
Augustus Ian McDonald Cork (1932 – 1980)
Ross Elwin Cork (1934 – )
Bruce Alan Cork (1936 – )
Janice Margaret Ann Cork (1941 – )
Elwin died on 20/08/1969 in Beacon Hill.
Jessica died in Mona Vale on 27/07/1999.