Using this site for the 1911
http://www.1911census.co.uk/& the free index on the advanced search, there is only one Albert Idris Davies of the right age. Once you're sure of the registration district, you can search on surname in that registration district with Albert Idris in 'other members of household' box, to find out who he was living with. Pretty sure the family I've found in 1901 is the correct one.
How about this Emma in 1901?
6 Charles St, Gelligaer RG13/5021 folio 155 pg 45
David Gwynne head mar 49 coal hewer b. Mon, Abersychan
Elizabeth wife 47 b. Glos, Thornbury
Harry son 21 coal hewer b. Mon, Pontypool
Thomas son 15 coal hewer b. Mon, Blaenavon
George H son 12 b Blaenavon
Clare dau 10 b. Blaenavon
G May dau 6 b. Blaenavon
Emma dau 5 b. Brithdir
birth reg
Emma Gwynne june qtr 1896 Merthyr Tydfil vol 11a pg 678