The James Madison genealogy is found below.  The Johnston/Mann genealogy is found beneath the Madison genealogy.  

A comparison shows that both lines begin with common ancestors. 

James Madison Genealogy

Sir George Barnes & Alice Brooke of Shropshire

George Barnes of London & Anne Gerrard

William Barne of Woolwich & Ann Sandys

William John Lovelace & Anne Barne

Rev. John Gorsuch & Anne Lovelace

Thomas Todd & Anna Lovelace Gorsuch

John Madison & Isabella Minor Todd

Ambrose Madison & Frances Taylor

James Madison & Eleanor Rose Conway

James Madison

Johnston/Mann Genealogy

Sir George Barnes & Alice Brooke of Shropshire

Edward John Potter & Elizabeth Barnes

John Potter & Alyce Clarke

William Potter of Lewes & Hannah "Ann" Langford

William Potter & Frances Potter

Joseph Potter & Phebe Ives

Charles Tyler & Rebecca Potter

Bazaleel Tyler & Abigail Johnson

Bazaleel Tyler & Sarah Calkins

Paul Tyler & Hester Hanna Brink

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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