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Going with the 'boilermaker' I searched in 1901 for George with an occupation boiler*, and of the pages of George Thomases countrywide, only one had anything to do with boilers
1901 Chatham Street, Machen Upper, Newport, Monmouthshire
THOMAS, James Head Married M 58 1843 Boiler Maker N K Gloucestershire
THOMAS, Sarah Wife Married F 56 1845 Mynyddislwyn Monmouthshire
THOMAS, Elizabeth Daughter Single F 36 1865 Mynyddislwyn
THOMAS, John Son Single M 31 1870 Boiler Maker Labourer Newport
THOMAS, Thomas Son Single M 29 1872 Blacksmith Striker Newport
THOMAS, George Son Single M 26 1875 Boiler Maker Labourer Machen
THOMAS, Sarah Daughter Single F 23 1878 Machen
THOMAS, Arthur Son Single M 20 1881 Railway Engine Cleaner Machen
THOMAS, Ernest Son Single M 17 1884 Blacksmith Striker Machen Mon
I found them in 1891 and 1881, but can't find any of the family in 1871. No obvious birth in Newport (the one George Edward was the wrong one - his father was William). Can't spot an obvious marriage for James and Sarah. In fact all we do know is that Ernest belonged to both of them and likely Arthur did too. Grrr.