+-- Davis 
Robert Glenn Davis 
|           +--Pierre Louis Bergevin-Langevin  (7 Jun 1753-25 Jul 1836)
|        +--Pierre Bergevin-Langevin  (1 Nov 1785-23 Sep 1863)
|        |  |  +--Francois Hebert  (1719-)
|        |  +--Agathe Marie Hebert  (1758-Oct 1835)
|        |     +--Marie Arsenault 
|     +--Sylvain Langevin  (8 Oct 1835-6 Jun 1923)
|     |  |  +--Albert Mercier 
|     |  +--Angelique Mercier  (ABT 1789-AFT 1861)
|     |     +--Madeleine Sauve 
|  +--Raoul (Rosie) Langevin  (25 Nov 1870-19 Jul 1951)
|  |  |  +--Antoine Moineau 
|  |  +--Odille Moineau-Moquin  (1830/1833/1837-1883)
|  |     +--Angelique Legros 
+--Leonella C (Nellie) Langevin  (1897-)
   +--Loretia   (1872/1874-23 Jan 1949)