John Alexander Williamson
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 | Cecily Jean Williamson 1921- |
| Cecily Jean Williamson | |
| B: | 1921 |
| Perth, Western Australia, Australia | |
| Ronald Charles Downing 1920-2007 |
| Ronald Charles Downing | |
| B: | 13 Sep 1920 |
| Cottesloe Beach, Western Australia, Australia | |
| M: | 1944 |
| North Perth, Western Australia, Australia | |
| D: | 3 Aug 2007 |
| Perth, Western Australia, Australia | |
| Charlotte Beatrice Maud Adams | |
| M: | 1920 |
| Mount Barker, Western Australia, Australia | |