Yes, please give me the dates of your grandfather's birth and death, and his SSN. I do believe we are on to something here, and I found four Donald Nebergalls in the Social Security Death Index, and one of them died in 1967. Not sure if this is your grandpa, but if you could give me those dates, it would certainly be helpful. If my calculations are correct, you are descended from the brother of my wife's gggrandfather. That is what I have been able to decipher from my searching on the Internet, and also with what I received from Vernon Nebergall in Omaha, NE. Please keep in touch, and we may be able to get to the bottom of this search.
I will be out of town for a few days (3), and I would just be pickled tink if there was a posting from you when I return. Thanks so much.