Árvore interativa de Robert Blackburn
–1876♂ Robert Blackburn
–♂ Dr … Blackburn
1808–1875♀ Catherine Pennington
1768–1850♂ John Pennington
1777–1853♀ Elizabeth Hargreaves
1744–1808♂ Richard Pennington
1748–1826♀ Margaret Leyland
1739–1796♂ John Hargreaves
–1808♀ Ann Hamer