+---John Mitchell (ABT 1799-BEF 1881)
? Mitchell 
(-BEF 1871)
| +---Alexander Bone
| +---Thomas Bone (ABT 1780-JAN 1844)
| | +---Rebecca Boney
+---Fanny Bone (ABT 1807-NOV 1888)
| +---William Blackmore
+---Frances (Fanny) Blackmore (ABT 1781-MAR 1849)
| +---Peter Birt
+---Grace Seage Burt (ABT 1755-)
| +---John Tregenza
+---Mary Tregenza (ABT 1725-)
+---Grace Seage