I think I have Jean Poisson's death date. I was going through my data, and I found it put in there, but I dont know where I got it from. Anyway, I think it's June 22, 1650. I know of one of his children, another Jean, who was born October 3, 1618, at St. Jean de Mortagne, Perche, France.He married Jaqueline Chamboy (Feb. 20 1624-Nov. 1 1694,) and I have them down from there to modern day. Hope that helps someone a little bit.