Gert Petrus Johannes Slabbert

If named after his maternal grandfather his full name would most likely be Gert Jacobus Slabbert.
He would most probably have been the second born son, but maybe not...

He was in fact named after his paternal grandfather, and was the first born son
Gert Petrus Johannes born 2 September 1907, baptised in Lichtenburg in October 1907, godparents Thomas' 2 youngest siblings
https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSVN-S95D-W?i=915&...

Could this be his marriage? in July 1937, in Pretoria, to Anna Maria Petronella Jonk, born Roux
https://www.familysearch.org/ark:/61903/3:1:3Q9M-CS27-CSRW-9?cat=83...
If it was him, he divorced in 1944
DEPOT TAB
SOURCE TPD
TYPE LEER
VOLUME_NO 5/644
SYSTEM 01
REFERENCE 763/1944
PART 1
DESCRIPTION ILLIQUID CASE. DIVORCE. ANNA MARIA PETRONELLA SLABBERT VERSUS GERT
PETRUS JOHANNES.
STARTING 19440000
ENDING 19440000