Hi Peter, thanks for the information. I don't think I'll ever work on mapping my chromosomes; I'm too busy mapping both of my parents'! The one thing I do, with having both parents as well as my own DNA tested, is when a person matches both my mom & myself (for example), I look to see if the person is on ancestry & has a tree there. Because too many people don't have trees attached to their results on Gedmatch. (Ditto with ancestry & FTDNA...) I still think the most useful thing we can do and stress to DNA testers is to get together the best 10-generation family tree you can and attach it to your results. The older we get, the more important this becomes. Some day we will die, and if we haven't attached our DNA results to a tree 'somwehere' (preferably Wikitree, since it's doing such terrific things with DNA so you can see who else descends from the same person & compare results), then our DNA results become useless, because no one will be able to know our lineage...