I do agree Maddy.
However, more thoughts on a quiet Saturday afternoon.
Regarding Neale's thinking the couple are Frederick Clarence Eggins and wife Evelyn Maud Eggins (nee BALE)
I can see a resemblance to the seated man in the photo in Reply #1.
Also in the one I have found online which is stated to be Frederick Clarence EGGINS. See below.
Evelyn had a girl in 1889 before she was married, Muriel Florence.
BALE Florence
33818/1889
Mother EVELYN M M
At LISMORE
After the marriage between Federick and Evelyn, the girl sometimes used the surname EGGINS,
This (unpleasant) news clip confirms the relationship.
https://trove.nla.gov.au/newspaper/article/234800194 In the in Memoriam following Frederick's 1913 death, placed by his children, Muriel is not mentioned .
The photo may be of mother, daughter and stepfather.