The Henry David Thoreau genealogy is found below.  The Johnston/Mann genealogy is found beneath the Thoreau genealogy.  

A comparison shows that both lines begin with common ancestors. 

Henry David Thoreau Genealogy

Thomas Andrews & Joan Belson

Thomas Andrews & Symmo Brunden

William Barnes & Mary Andrews

Thomas Barnes & Abigail Goodenow

Josiah Jones & Abigail Barnes

Elisha Jones & Mary Ann Allen

Asa Dunbar & Mary Jones

John Thoreau & Cynthia Dunbar

Henry David Thoreau

Johnston/Mann Genealogy

Thomas Andrews & Joan Belson

Henry Gilbert Andrews & Elizabeth Bond

Francis W. H. Andrews & Mary Pool 

Henry Andrews & Katherine Andrews

John Birchard & Christyan Andrews

John Calkins & Abigail Birchard

John Calkins and Sarah Huntington

Bazaleel Tyler & Sarah Calkins

Paul Tyler & Hester Hannah Brink

Ebenezer Tyler & Martha Childers

Lewis Jackson Mann & Martha Tyler

Dorsey Virgil Mann & Mary Jane

John Allen Mann & Nellie Lourie Herron

John Mann Jr. & Rosalyn Johnston

Timothy A. Mann

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