Hiyas,
Maybe William died after 1985 or moved states?
If we could find obits or ages for
GORDON William John Probate notice 11APR1988 Publication late of Essendon, formerly of Strathmore The Age (Melbourne)
This guy was in VIC by 1937 when he married Myrtle May TURNER.
MITCHELL William John Death notice 15MAY1989 Death Sydney Morning
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Kellie