This is the 1901 for Eglwysilan you mention
H W Agland 34 b Devon (Henry William per previous census entries)
Elizabeth 32 b Caerau, Glamorgan
Frances E 12
Elsie May 10
Ida 9
Lily 8
Percy 6
Beatrice May 2
John Davies 30
I have been looking for Frances on the free 1911 index without success so decided to look for her parents instead. Using the instructions below shows a 5yr old Glyndwr Agland in the family (indexed as Glyardwl) but no Frances so she appears to have called her son after her brother
USING THE FREE 1911 INDEX TO DETERMINE THE CORRECT HOUSEHOLDhttp://www.1911census.co.uk/search/tnaform.aspxOnce you find a possible match - make a note of the county and district in which the person was living
Return to the index and in PERSONAL DETAILS - just put the surname of the family - nothing else
In LOCATION - Select the county and below it - type in the district
In OTHER MEMBERS OF THE HOUSEHOLD - show the full name of the person you have found on the index
Click SEARCH
The 1911 census is strictly pay per view so you will have to buy credits to view the full entry - the above instructions will only help to possibly show others of the same name in the same household