I have been contacted by someone who says we are half sisters due to our DNA match. Our DNA is 1,781 which apparently is a high match.
Would this make us half sisters?
I am an only child and she is adopted.
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Another task for DNAPainter
It says possible relationships are:
I'm guessing that you can rule out some/most of these.
Half-sister is quite possible for people who share 1781 cM of DNA; they usually fall between 1160 and 2436 cM, and 1781 is right in the middle of that range.