Thanks for looking though 👍
There are a number of children born to a Stephen and Mary A ELPHICK :
1857 James (Camden)
1858 William H (Camden)
1860 Stephen Henry (Yass)
1862 Jane (Yass)
1863 Mary A (Gundagai) died 1863
1865 Elizabeth (Gundagai)
If the oldest child in the trove article was around 7 in 1865, this could fit with this family - though I realise there is 1 extra child.
Stephen ELPHICK married Mary Ann THOMAS at Camden in 1856.
Though there are a few deaths for Mary ELPHICK, none in the correct time frame. 
Modified to add:
Sorry, I think I'm wrong - there are births to Stephen and Mary Ann ELPHICK after 1865 at Gundagai, so unlikely to be the family in question.