This was my grandmother's twin sister. However, some of the information is incorrect.
This is the correct information:
Elsje Sophia Johanna (my grandmother known as Ella) and Susanna Catharina Jacoba (known as Suzie) were twins, born on 4.4.1913 to Christiaan Johannes van der Heever and Susanna Catharina Jacoba Rautenbach. Note that it is Van der Heever and not Van den Heever.
My grandmother married Andries Stefanus Cronje and aunt Suzie married Johannes Jakobus de Wet.
Susanna Catharina Jacoba de Wet nee Van Der Heever and Johannes Jakobus de Wet only had one child, a daughter named Sonia. That is my aunt.
In other words Susanna was her mother and not her daugther.
Thank you very much indeed for he correct information on the family. Please check that I have got it down correctly. You will notice that I have kept the family names at birth and no married names. This was requested by our coordinator. Please if possible can I get birth dates, death dates, place of birth and death. This would be greatly appreciated.