Q: Passage: Lorraine Baines-McFly (portrayed by Lea Thompson and voiced by Aimee Miles in Back to the Future: The Game) is the wife of George McFly and the mother of Marty, Linda and Dave. She is the eldest daughter of Sam (George DiCenzo) and Stella (Frances Lee McCain) Baines, and sister of Milton (Jason Hervey), Sally (Maia Brewton), Toby, and Joey.

Question: Based on this passage, who played the sister in back to the future?
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This is the relevant information: Lorraine Baines-McFly (portrayed by Lea Thompson and voiced by Aimee Miles in Back to the Future: The Game) is the wife of George McFly and the mother of Marty, Linda and Dave. So the answer is Lea Thompson.