Jon Yngri (the younger) Vernhardsson was my grandfather. Jon Eldri (the elder) Vernhardsson/Leifur was my great-uncle. Sorry it has taken seven years to get back to you, but I just started my "Johnson Jr" tree about two weeks ago. We visited Iceland, including the homeplaces of Efri Sel and Eyrrarbakki, in 1999. Did we meet at Darrell Watson's "Leifur" Reunion in 2000?
I have a GENI tree going back to AD 860, and will invite you to it. Need your connections and e-mail to do that.
Richard E. Johnson, email@example.com