The Mystery Triplets are the three daughters of Dipper Pines and Wendy Corduroy. There's Rachel (Rachel Marie Pines), Maddy (Madalyn Rose Pines) and Cat (Catherine Delilah Pines). In the year 2039, at the age of twelve, the three girls are sent to Gravity Falls, Oregon to stay in the Mystery Shack with their Great Grunkle Stan, who doesn't seem to have aged since 2012, when Dipper was the same age as the girls are now.

Their cousins are Dani, Lindsay and Maddi (The Pines Triplets).

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