John Thomas Blackman was born 22 September 1843 in Windsor, New South Wales, Australia to Samuel Blackman (1819-1903) and Jane Hoskisson (1827-1907) and died 3 May 1940 Manly, New South Wales, Australia of unspecified causes. He married Mary Ann Hearn (1841-1922) 2 June 1880 in Cobbitty, New South Wales, Australia.
|Offspring of John Thomas Blackman and Mary Ann Hearn (1841-1922)|
|Oswald John Harley Blackman (1882-1882)|
|Rosie May Blackman (1883-1883)|
Some researchers have confused him with John Thomas Blackman (1857-1936), assigning him the latter's children as well. He has also been confused with John Blackman (1824-1914), marrying the latter's wife.