Familysearch.org (FS) has the following information available which I hope may be of use
Jan Hendrik Izak Christoffel Dekker FS ID LRZW-RLC born 15 September 1882 – died 4 August 1974
Spouse Petronella Buckle FS ID G3XJ-16M born 1 November 1886 – died 10 September 1965 – burial Beaufort West, Cape Province, South Africa.
Also listed as Petronella Jacoba Buckle FS ID LRZW-RK8 her parents are listed for this name
I suggest you go to Familysearch.org to check ALL the information that is available
NOTE: I am passing this on for your information – I can only be guided by what is on that site, correct or not. Sources may/may not be available
Cheers Ross Geissmann