I have a match on AncestryDNA.  AncestryDNA reports that it is a 6cM match.  The match contacted me, and reported that although I don't match either of her parents, the small segment "... means that both of them are matched to you and together their DNA adds up to a match to me but is not enough for them separately" It is true that we both have ancestry from a small parish in Cornwall that intermarried for at least a century or two.  I didn't spot an obvious connection on our trees, but I didn't inspect closely. I've suggested to my match that this segment is a false positive; she is reluctant to give up her idea.  I've provided two links about false positives. Anyone have thoughts about this?  Either direction. Thanks!