Interactive tree of Frederick John Richard Thomas Roydhouse
1970–♂ Stephen Paul Thurlow
1939–♀ Joyce K. Roydhouse
–♂ Joseph W. Thurlow
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
1816–1849♂ Thomas Henry Roydhouse
1809–1874♀ Sarah Anstiss
1812–1896♂ George Pocock
1818–1892♀ Ann Andrews
1838–♂ Joseph David Curtiss
1838–♀ Charlotte Hubbard
1846–♂ James Thomas Parker
1847–♀ Louisa Withers
1879–♂ Albert John Cook
1877–♀ Catherine Ann Kingman