až do 12. generace
0━┳ Richard Palgrove Birch 1883-1946 &1906 Susan Elizabeth Conn 1887-1965 ┣━1━━ Richard Joseph Birch 1906-1963 ┗━2── Susan F. Birch 1909-1965
Celkem: 2 potomci (4 osob s [spouses])