I have managed to find the following at the archives. Looks like Doris Kathleen did not have a very good marriage record!
Copies of the KAB records can be ordered directly through the Cape Archives, and the TAB one through eggsa.org It is unlikely that names of children will be mentioned in the divorce documents, but it is possible that they could be mentioned in Eustace's estate file.
DEPOT KAB
SOURCE HAWC
TYPE LEER
VOLUME_NO 1/3/58/1/37
SYSTEM 01
REFERENCE 67
PART 1
DESCRIPTION MARRIAGE REGISTER. CAPE TOWN AND WYNBERG. EUSTACE WILEY AND DORIS KATHLEEN GEEKIE (FORMERLY HARRIS, BORN HEWITT).
STARTING 19540000
ENDING 19540000
REMARKS MARRIAGE CERTIFICATE.
DEPOT KAB
SOURCE CSC
TYPE LEER
VOLUME_NO 2/1/1/1303
SYSTEM 01
REFERENCE 12
PART 1
DESCRIPTION ILLIQUID CASE. RESTITUTION OF CONJUGAL RIGHTS. JOHN MCDOUGALL GEEKIE VERSUS DORIS KATHLEEN GEEKIE, BORN HEWITT.
STARTING 19370000
ENDING 19370000
DEPOT TAB
SOURCE MHG
TYPE LEER
SYSTEM 01
REFERENCE 8662/75
PART 1
DESCRIPTION WILEY, EUSTACE.
STARTING 19750000
ENDING 19750000
REMARKS SURVIVING SPOUSE DORIS KATHLEEN WILEY.
DEPOT KAB
SOURCE CSC
TYPE LEER
VOLUME_NO 2/1/1/1439
SYSTEM 01
REFERENCE 171
PART 1
DESCRIPTION ILLIQUID CASE. RESTITUTION OF CONJUGAL RIGHTS. CECIL HULME MARTIN VERSUS LESLY MARION MARTIN, (BORN HEWITT).
STARTING 19430000
ENDING 19430000