I know very little about how DNA testing and confirmation works, although I have read over the help pages. I am curious if the possibility exists to resolve questions that are not able to be resolved readily on paper:
I have an ancestor (as several of us here do), John Crawford (https://www.wikitree.com/wiki/Crawford-451) whose paper trail is, admittedly, lacking in clarity. Some believe that he is descended from the Crawford line from Scotland that can be traced back through landed and titled folks to the Crawfordjohn branch of the family.
If I have relatives who have taken DNA testing, and/or I take a test myself, and we have paper trails that confirm ancestry to John, then good, that confirms we come from his branch of the family. Yes, I know, "confirms", work with me here.
If family members who are descended from the branches that stayed in Scotland or emigrated elsewhere have also taken DNA tests, is it possible to confirm that John's line converges with theirs and therefore he is in fact descended from that family, although not documented precisely? Or is that way too far back in time to be reliably solving this mystery?
To muddy the waters, it appears his son David (https://www.wikitree.com/wiki/Crawford-335) married Jane A Crawford (https://www.wikitree.com/wiki/Crawford-437), and they both may have had the same 5G-grandfather, if some trees are to be believed.
While it would be nice to find proof of relationships for John, for me it would suffice to say "well, we don't have a paper trail but we can say the DNA evidence shows he was indeed a member of that branch of the family". (Until the mysterious Scottish Dead Loch Scrolls show up with written confirmation attested to by James I, co-signed by Cromwell and witnessed by Nessie)