Thanks Frank, but unfortunatly this is not a match. The sad thing is Johannes and Hester only have one sibling left alive today, and all my efforts to get the information directly from that source (my aunt) has to date failed. I will however still keep trying.
UPDATE: So far my research indicates that Simon Christoffel Jacobus Bosch born 13 Jan 1854 in Somerset East, Cape province who married Elizabeth Johanna Susanna Bosch (nee Unknown) born about 1865 are the parents of Johannes Hermanus Bosch born about 1887 and Hester Magdalena C. Bosch (nee Oosthuizen) born 23 Oct 1894 and died 1 Jul 1972 in Winterton, Natal.
Update 2: This request has now been satisfied, and requires no further research, thank you.