Just for information, you can share your DNA matches with someone. You can let them just view them, or manage them (which I know several people do for relatives).
This was useful for me as that is how I found a shared match with the person I don't match with. I had looked at this match myself but the sparse tree didn't give me sufficient information to see which ancestral line we had in common. Now I can deduce it from one of the surnames which the two other people share.
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