Hi,
In case you haven't got it yet, birth entry from freebmd.rootsweb.com
Richard John Firmin, b. 1893 Poplar
Then I looked for Richard in 1901 census, but I don't know...
Two Richard Firmans are listed:
age 6, b. Steeple Bumpstead
age 7, b. Norfolk Silfield
I don't have access to get you the families, but someone else definitely will. Maybe post another message, asking for a 1901 lookup for Richard.
(hopefully it's not another case of missing Firmins - I'm also researching this name, and my people were missing from 1901!)
Good luck!
Charlotte