Where Trisha came from is sort of explained in one episode, but it's a strange story.
Actually, Trisha isn't related to the Stones in any way, even though she calls Donna "mommy" and Alex "daddy." Her last name isn't Stone. She's not adoped, unless you count the way in which a stray dog or cat might be "adoped." Basically, Trisha is a stray. She has an uncle who is apparently her legal guardian, but he never seems to visit her. About the only part I found believable about Trisha's introduction was that Mary at first resented Trisha because of all the attention she got. Trisha, by the way, is played by Patty Peterson, Paul Peterson's real-life little sister.
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