The last census that’s available is the one from 1911(at the time of writing). William Daniel (Big Daddy) is now head of his own young family and settled in at 13, Baden Terrace, Merthyr Tydfil. The census also asks which language they speak and the answer is ‘both’ for Big Daddy.
William Jones Head 37 Married Coal Miner Hewer Worker Merthyr Tydfil Both Languages
Ann Jones Wife 37 Merthyr Tydfil
William J Jones Son 14 Single Colliers Assistant Merthyr Tydfil English
Hannah M Jones Daughter 13 School Merthyr Tydfil English
Ivor Jones Son 11 School Merthyr Tydfil English
Blodwen Jones Daughter 9 School Merthyr Tydfil English
Olwen Jones Daughter 7 School Merthyr Tydfil English
Emlyn Jones Son 8 School Merthyr Tydfil English
Gwladys May Jones Daughter 1 School Merthyr Tydfil English