Jerry - It is a small world, I guess. I am a grandson of Grampa as well, so I am a first cousin to your wife. Please email me at: firstname.lastname@example.org
and I will help all I can. I ran across some new info to me last night that traces one of the Halterman sidelines back to a marriage in Switzerland in 1588 and I have not even checked yet to see about all of the lines that branch off from the one I am referring to.