Jacob Abraham Myers & Dinah Barnett had a son HENRY MARK MYERS in 1901 Adelaide. Here is the birth transcription - it's the first time I've seen Jacob called 'Jack'.
The Sydney Morning Herald 18 January 1901: BIRTHS
MYERS - January 15, 1901, at her residence 124/194? Franklin Street, South Australia, Dinah, wife of Jack Myers, and youngest daughter of Mark Barnett, of Sydney, a son.