There's a Blanche Amelia baptised in Birmingham 9 Nov 1904 to father George mother Amelia but would need to cross check the marriage record to see if father was George.
Here is Blanche with her parents and siblings George, Harry & Mary in 1911
https://www.familysearch.org/ark:/61903/1:1:XWZH-L6PGRIFFIN, BLANCHE AMELIA
mmn CASHMORE 1905 M Quarter in BIRMINGHAM Volume 06D Page 107
added - marriage Dec 1898 West Brom
George Frederick GRIFFIN Amelia Annie CASHMORE
Have you checked the 1939 register for Hedley & Blanche
Edited to add
Here is Hedley with his mother Joanna and brother Leonard in 1911
https://www.familysearch.org/ark:/61903/1:1:X72D-FTR
Marriage 1903 Atcham
John Thomas Ratcliffe and Joanna Owen
Gunner
Leonard RATCLIFFEService Number: 326429
Regiment & Unit/Ship Royal Artillery 75 (Shropshire Yeomanry) Medium Regt.
Died 26 November
1943 Age 40 years old
Buried or commemorated at Cassino War Cemetery I. D. 13. Italy
Country of Service United Kingdom
Son of
John Thomas Ratcliffe and
Joanna Ratcliffe;
husband of Violet Ratcliffe, of Sutton, Suffolk.
https://www.cwgc.org/find-records/find-war-dead/casualty-details/2609958/LEONARD%20RATCLIFFE/https://www.findagrave.com/memorial/56058751/leonard-ratcliffeRATCLIFFE, LEONARD
mmn OWEN GRO Reference: 1903 J Quarter in ATCHAM Volume 06A Page 704 Occasional Copy: A
RATCLIFFE, HEDLEY
mmn OWEN GRO Reference: 1904 S Quarter in ATCHAM Volume 06A Page 658