Undertale Sister Scenaions
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[Y/N] is a 22-year-old female skeleton that lives in Snowdin, with her to younger brothers Sans and Papyrus. Sans is the second oldest being 21 and Papyrus is the youngest being 17. The three skeletons lost there mother Arial, in the war between Monster and Humans. Their father Doctor W.D. Gaster, died when the CORE exploded, unfortunately, no one remembered him but Sans and [Y/N].
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