In order to Y-DNA triangulate on Digory SARGENT we would need the patrilineage of a descendant of his son John SARGENT (m Abigail JONES). This descendant must also have been Y-DNA tested. We already have three patrilineages arriving on Digory through his son Daniel aka SERIEN LANGLAIS. We need support from descendants of his other son John. If the triangulation is successful it will be added to our Catalogue of Ancestral signatures at http://signatures-ADN.org
I am the administrator of the French Heritage DNA project at FTDNA.