I am looking for Jan Hendrik Isak Christoffel Dekker (or Decker), born 1884

Question

He died 1974 in South Africa

Answer 1

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