The John Quincy Adams genealogy is found below.  The Johnston/Mann genealogy is found beneath the J.Q. Adams genealogy.  

A comparison shows that both lines begin with common ancestors. 

John Adams Genealogy

John Waterhouse & Elizabeth Giles Horsefall

James Jacobus Baxter & Alice Alicia Waterhouse

Samuel Thomas Baxter & Alice Firthe

Gregory Baxter & Margaret Paddy

Unknown Adams & Abigail Baxter

Joseph G. Adams & Unknown Adams

John Adams & Susanna Boylston

John Adams & Abigail Smith

John Quincy Adams

Johnston/Mann Genealogy

Robert Waterhouse & Sybil Savile

Richard Waterhouse & Isabel Wade

John Ramsden & Susen Meg Waterhouse

William Hugh Childers of Jamestown & Ann Ramsden

Abraham Childers & Jane Anne Howard

Abraham Childers & Ann Milner Pew (Pugh)

Henry B. Childers & Lucretia Jones

Henry Philemon Childers & Mary D Farmer 

Thomas Childers & Charlotte Brewer

James Childers & Nancy Jones 

Ebenezer Tyler & Martha Childers

Lewis Jackson Mann & Martha Tyler

Dorsey Virgil Mann & Mary Jane Moyer

John Allen Mann & Nellie Lourie Herron 

John Mann Jr. & Rosalyn Johnston

Timothy A. Mann

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