https://trove.nla.gov.au/newspaper/article/15685417?
The Sydney Morning Herald (NSW : 1842 - 1954) Mon 10 Jul 1916 Page 8
DEATHS
PORTUS.-July 9, 1916, at 65 Victoria-street, Potts Point, Hannah, widow of Henry Dumaresq Portus, aged 75 years.
NSW Death 9963/1916 PORTUS HANNAH - SPENCER - HARRIET - SYDNEY * 9 Jul 1916
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PORTUS John Oxley Death notice 10JUL1901 Death 72 at Mt Morgan, Queensland, late of Rockhampton, formerly of Morpeth Sydney Morning Herald 13JUL1901
Qld. Death registration:
John Oxley Portus
Death date:11/07/1901
Mother's name: Elizabeth Hannah
Father/parent's name: John Portus
Registration details:1901/C/3594
So that's a son.