+---William H Gerrens
| +---Mary ? 
+---Charles Gerrens (06 JAN 1878-29 AUG 1943)
| | +---Alexander Bone
| | +---Thomas Bone (ABT 1780-JAN 1844)
| | | +---Rebecca Boney
| | +---Charles Bone (ABT 1824-)
| | | | +---William Blackmore
| | | +---Frances (Fanny) Blackmore (ABT 1781-MAR 1849)
| | | | +---Peter Birt
| | | +---Grace Seage Burt (ABT 1755-)
| | | | +---John Tregenza
| | | +---Mary Tregenza (ABT 1725-)
| | | +---Grace Seage
| +---Ellen Bone (ABT 1852-)
| +---Mary Ann Westlake (ABT 1827-)
+---Frederick Gerrens (1924-1986)
| +---Margaret Ann Rogers
Fred Gerrens