| | 1. Arthur Faure Williamson, b. 22 Jan 1955, Mary Mount, Johannesburg, South Africa d. 1 Mar 2025, Dallas, Texas, USA (Age 70 years) |
| | 2. Herman Joseph Williamson |
| | 3. Catharine Margaret Williamson |
| | 4. Carol Helen Williamson |
| | 5. Francis Xavier Williamson |
| | 6. Louisa Joan Williamson |
| | 7. Deneys Molteno Williamson |
| | 8. Rory Anthony Gregory Williamson, b. 17 Nov 1962, Johannesburg, Gauteng, South Africa d. 24 Mar 2005, Borrivier, Western Cape, South Africa (Age 42 years) [Father: Adopted] [Mother: Adopted] |
| | 9. Monica Theresa Williamson |
| + | 10. Adrian Lindley Williamson |
| + | 11. Susanna Maria Williamson |