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Male William Underhill Click to view William Underhill in the family tree

1   William's father was Thomas Underhull and his mother was Isabella.  His paternal grandfather was Richard De Underhull.  He was an only child.  He died after 1423.1 

Family Details of William's family with Joan Unknown

1 phelps.FTW
Further source/citation:
World Family Tree Vol. 1, Ed. 1 @ Tree #3069