Hugh, I am a descendent of James Campbell, who married Esther Marshall and whose land was near John's in Rich Valley. My group has done a Campbell DNA test (111 marker) to see how we link to John. The jury is still out (we hope to upgrade another relative's test for clarification), but we do know we have a close link. Do you know of my James? How about Joseph (known as Lt. Joseph) Campbell, who we believe to be either brother or cousin to James and possibly to John. We are still checking documents, slowly. Any info you have or leads you can share will be greatly appreciated.