You could look for an emigration from Canada to England - perhaps under a different family name, as there was a John Rolph who was apprenticed 26 Aug 1873 to the Neville, in Henisworth, London.
It is also possible that other family name was Doucett -- living in Newcastle, Northumberland, New Brunswick -- as it appears his mother married a James Doucett (who was, according to the 1871 Canada census, both married and a widower). Also in the 1871 census were Samuel J Doucett, aged 5 years; Elizabeth Doucett, aged 4 years; and William James Doucett, aged 2 years.
Margaret - a widow - and John show on the 1861 census as living in Northesk, Northumberland, New Brunswick.
I haven't found any emigration - or immigration - records at all, thus far.