Petra GROBBELAAR married Jakobus Wilhelmus Johannes PRETORIUS 1920–1991 Gerrit Stefanus PRETORIUS Russel PRETORIUS Gottlieb Jacob PRETORIUS Children of Petra GROBBELAAR and Jakobus Wilhelmus Johannes PRETORIUS Gerrit Stefanus PRETORIUS married to Marcelle LOTTER Russel PRETORIUS Gottlieb Jacob PRETORIUS married to Maria Magdalena KOEN