You may be missing a generation or two. Jean the original imigrant had two sons Pierre/Peter and Moes/Moses. Peter had aleast two sons Peter and John. This John married Mary Guthrey daughter of Bat Guthry and settled in Bedford Co. Va. Moses also had a John who settled in Chesterfield Co. Va. The exact number of chidren these three cousins had is unknown, but the next generation also contained John's and it is this generation that is showing up in records of 1790-1810. Many trees start with John, but which one? As to Sejus or Liza, there appears to be two. The one I have records on is possibly a daughter of Henry who married a Crank. Is Sejus a name or the misreading of the name Liza. Written records can not prove this, only the handed down verbal history of the family. As I not a 1800 century handwriting analist and this is not my branch I will bow out.