Grace (Grissel) Allan (1756- ) 
|
Alexander Williamson (1787-1865)
|
| Barbara Spence (1787-1859) |
| James Williamson (1816- ) |
| George Spence Williamson (1817-1881) |
| Barbara Williamson (1819- ) |
Alexander Williamson (1822-1869)  |
| Grizel (Grace) Williamson (1823- ) |
| Henry Williamson (1826- ) |
| Robert Williamson (1829-1873) |
| Mackintosh Williamson (1830-1882) |
| David Robertson Williamson (1832- ) |
