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First words were "este" ("this" in Spanish), "ball" and "Dadda".
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Favorite foods are chicken nuggets, macaroni, and chesse, pizza and fruit.
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When Kristopher was sick, he went to the ER where he was given a teddy bear from one of the nurses. He now sleeps with the teddy bear.
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Telling them apart: Kristopher is the slightly thinner twin and his hair is a little bit darker than Jason's. His chin is also a bit pointier than his brother's. Jason's face is fuller and rounder.
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Since the end of Season 5, they have played the character Wyatt Matthew Halliwell on the TV series Charmed.
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Jason is cautious and affectionate while Kristopher is wild and flirtatious.
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An interview with their parents and the cast & crew of Charmed was in Xpose magazine isusse #87, June 2004, tittled: "Family Matters".
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The twins did a commercial for Cargill Baby Food (2003).
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They are half Ecuadoran, on their mom's side and they understand Spanish very well however they just don't speak it.
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For crying scenes when the twins were younger, their mom would leave the room for a few minutes and the boys would cry for her.
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Kristopher & Jason don't interact with the demons on Charmed, they get scared when they see them.
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Their mother, Maria, was a fan of the show long before she ever got pregnant with them.
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When Kristopher & Jason watch Charmed and see a scene with Wyatt they both think it's them in the scene.
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Kristopher & Jason refer to the actors on Charmed by their characters' names. Example: Holly is "Mommy Piper" and Brian is "Daddy Leo".
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Kristopher is younger by one minute at 6:23pm.
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Kristopher has medium blonde hair and blue/green eyes (depending on what he's wearing).
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Kristopher's Zodiac sign is Virgo.
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Kristopher has half brother, Patrick, who is six years older.
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At the end of the Seaosn 7 episode "Imaginary Fiends" Wyatt ends up talking quite a bit which caused for the first time ever the twins Kristopher and Jason Simmons who portray Wyatt to be credited since since joining the cast in Season 6.