Woman discovers favorite teacher from college is actually her biological sister

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SPENCERPORT, N.Y. -- A New York woman was shocked to find out that her long-lost sister was not a stranger, according to ABC News.

Diane DiProspero was put up for adoption as a child, and she'd been searching for information about her biological family, ABC News reports.

DiProspero told ABC News that she recently got a letter from the New York State Adoption Registry and found out her favorite teacher in college 30 years ago was actually her older sister.

"When I started talking to her-I realized that we have the same mannerisms," Karen Cometa-Zempel told ABC News. "The parties the upbringings, celebrations, love of shopping, laughter, everything."

The sisters say they are currently busy making up for lost time.