1942–♀ Mavis M. Roydhouse | | | | 1916–1985♂ Arthur Roydhouse 1921–1996♀ Nancy Ilene Gardiner | | | | 1886–1963♂ Arthur Roydhouse 1887–1976♀ Eliza Nicholson | | | | 1854–1900♂ William Clark Roydhouse 1855–1932♀ Elisabeth Harrison | | |
| | | 1863–1914♂ Charles Nicholson 1860–1906♀ Ruth Blackburn |
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