No info given re timescale
Per freebmd the marriage was 1937 so child may still be alive. Rootschat has a strict no living persons policy so you need to remove his name from your post. You can use freebmd to find any other children born to them
Have you looked on the 1939 register to establish birthdates for George & Doris?
Use freebmd to find their birth registrations. If they were born from mid-1911 their mothers maiden name will be shown.
www.freebmd.org.ukUse that info to find their parents marriage on freebmd then look them up on the 1911 census
If they were born before 1911 use the birth reg info on freebmd on GRO online to find mothers maiden name
https://www.gro.gov.uk/gro/content/certificates/Login.aspAll censuses are available free on
www.familysearch.org1939 register info is only available via subscription