Dear Pat,
I have looked through the 1881 Census for the Isle of Man and came up with one Robert Swan STEPHENS, born Ramsey, Isle of Man.
Head, Age 37, Widower,occ Barrister ( in actual practice )

Looking on the 1891 Census Index:
Name, Age, Parish, District, Entry, Born
Robert S. STEPHEN - Age 47 - Braddan - 1 - 6 - Ramsey
Anne Massey STEPHEN - age 46 - Braddan - 1 - 6 - GBE - his second wife?

This is all I can find for you, sorry.
The other Robert STEPHENS found in 1881 were:
Robert STEPHENS, A Gen LAB from Durham, aged 36, Unm.
Robert Jewitt STEPHENS, aged 29, Married, Ship Insurance Clerk, born Sunderland.
Robert STEPHENS, age 38, Gardener/Domestic, Married, born Scotland.

Good Luck with your search:0))
Kindest Regards,
Carol