You're probably looking for Martha Susan SAAYMAN, not Snymaan.
Hi E Mapstone
You will have to do some work as this is not online jet:
LDS Microfilm #1295270 Item 6: Uitenhage Births 1906-1908 Page 251 Father: William James MAPSTONE Mother: Martha Susan SAAYMAN Child: Evan James Born: 3/12/1908
I think Margaret married a Swart Second hand information received from Jean Uljee (my Father William James Mapstone born in Kimberly August 1913, deceased 14th July 1951 in Durban)