inspired guess - in 1881 Robert Curphey + wife Mary (he a pleasure boat owner) were at Shipyard court (off Fort St) in 1881 directory Curphey, Robert, boatman and fishbuyer, 1 Shipyard-court

I wonder if he was the father ? as aged 41 in 1881

An alternative is Wm Curphey + Lizzie - 2 Bond Lane (also near market place ) - a fish salesman with a 1 year sonold Robert L Curphy

you need check later censuses to see age - I don't have these