Jacque (James) S. Duval - Germantown, PA

My GGG grandfather imigrated to the US somewhere around 1790 and married a lady with maiden name of DuMont and one of their son's names was W. B. Duval and the family was granted land in AL under the Vine and Olive Act of 1817. W.B. had a son names eithe John or James and this son married Nancy Ann "Jensie" Young Quimby Duvall and he died around 1870 in Clark County or Meridian MS They had one child and that was my grandfather James Dumoont Duvall. It is my Great Grandfather that I am trying to find info on and can you help???