Kathleen?
Not seeing a Kathleen. Free BMD has these likely births in 1911, 1913 & 1914 :
Norton Phyllis L Round Gloucester
Norton Sydney E Round Chipping N.
Norton John D Round Chipping N.
Of these, Sydney and Phyllis appear to be at home with Frank and Beatrice in 1939, along with Phyllis' husband, a Donald Goldsmith Johnson.
Marriages Dec 1935 :
Norton Phyllis L Johnson Romford
Johnson Donald G Norton Romford