Hello
I searched for your family in 1881, but couldn't find an exact match. I also searched the 1901 Census for your William Price Roberts:
Here are the 1901 Possibilities:
Age Where Born Administrative County Civil Parish Occupation
William Roberts 31 Corn ... Glamorgan Swansea Flour Merchant Traveller
William Roberts 32 Glamorgan Brynhyfryd Glamorganshire Swansea Licenced Vichilar
William Roberts 32 Glamorgan Cwmtwrch Glamorganshire Swansea Spelterman Spelter Works
William Roberts 32 Swansea Glam Glamorganshire Swansea General Labourer
William Roberts 33 Glamorgan Swansea Glamorgan Swansea General Labourer
William Roberts 34 Glamorgan Swansea Glamorganshire Swansea Undertaken
As you know he was a coal miner, The spelterman and the 2 other General labourers may be your Grandfather.
With regards to finding his wife/ childrens names, have you any idea when your Mother Lydia was born? this may give some scope on the timeframe your Grandparents married, another way is if you know the quarter William died in 1928, is to search the obituary notices. That usually gives you husband/wife names and any children or other relations names.
Hope this has helped you.
