Robert Williams - interaktywne drzewo
1883–1970♂ Ellis Fergusson Roydhouse
1875–1964♀ Gertrude Annie Swift
1908–2000♀ Mary Ellaline Poingdestre
1888–1889♀ Gertrude Marian Roydhouse
1902–1902♀ Female Roydhouse
1853–1931♀ Hannah Haigh
1850–1894♂ Thomas Roydhouse
–♂ Robert Williams