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I recently received my DNA match from Ancestry,and I share 1,591 centimorgans across 53 segments with one and 1,773 centimorgans across 58 segments with another.

Could these people be half siblings?

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Yes.

DNA Matches of 1,591cM and 1,773cM indicate half siblings as being a possible relationship.

On the strength of those matches the two people could also have one of these relationships to the person tested:

  • Grandparent/Grandchild
  • Aunt/Uncle/Niece/Nephew

but perhaps these can be ruled out on what you know of your family's generations.

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