Could a person with 1,782 cM actually be my half-sibling?
This person is listed as close family to me, yet I do not know them.
My cM is the same as this person's.
I do have 6 paternal half siblings however.
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DNAPainter suggests several possible relationships for 1782cm shared DNA.
I suspect that some of them you can rule out immediately (grandparent, for example).
But yes, half-sibling is one of the possibilities.