Son James and wife Jemima are in Cardiff in 1891. He is a teacher of Matematics, aged 33, b. Scotland
RG12/4386/84/62 See below - in Govan
The info on the Poor law report looks a bit out if it was written in 1857 as James was born 1856-1858 according to the censuses. Have you have traced him back correctly.
Are you sure Margaret Robb married James Robertson as the marriage entry gives her name as Gray, MS Robb.
Gadget