Jim, I am re-reading this and my dimmer switch turned low (again). Where is my thinking mis-firing? I am working on a family project. We are all doing TG and segment studies. We are focusing on a common set of great grandparents. For me they are my 5th great-grandparents. I am coming up with loads of matches who also match this couple. How do I determine which chromosome is from my fifth great grandfather and which is from my 5th great-grandmother when we all share both in our trees? I am sticking with chrs over 15 cMs. This couple had 9 children. I am matching with descendants from four of those nine children so far. I have tried comparing with the maternal surname and though I am finding matches, I have not yet been able to define who her father was as she is not showing up in any of the paper trails of those with the same surname who lived in the same area (we’re talking walking distance) at the right time.