Theo Meiner is the aunt of Kristy Thomas, the middle sister of Colleen Miller and Elizabeth Thomas-Brewer, the wife of Neal Meiner, and the mother of Luke Meiner (10), Emma Meiner (8), and Beth Meiner (1). She appears in both the novel and graphic novel for Kristy's Big Day. She is friendly and warm to Kristy and other members of her family.

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