| | 1907–1975♂ Frederick John Richard Thomas Roydhouse 1908–1996♀ Kathleen Ann Cook | | | | 1875–1936♂ Frederick William Roydhouse 1876–1902♀ Ellen Elizabeth Curtiss 1871–1934♀ Louisa Frances Parker | | | | 1844–1918♂ Joseph Thomas Roydhouse 1844–1930♀ Charlotte Pocock | | |
| | | 1838–♂ Joseph David Curtiss |
| | | 1846–♂ James Thomas Parker |
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| | | 1877–♀ Catherine Ann Kingman |
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