Hi Oscella,
I have that he had 2 children with Anastasia Murphy. She had children with Michael Kelly (who she married in 1866), then John Dow, then Percival Cochrane.
The children with Percival (that I have) were:
Sarah Jane b1879
Elizabeth b1885
The other children may have been Anastasia's surviving children, although I can find only 1 - Catherine Dow b 1873.
Anastasia was the sister of my GG grandfather. She died in 1939.
So the Cochrane boys parents were Robert & Jane?