First words were "este" ("this" in Spanish), "ball" and "Dadda".
Favorite foods are chicken nuggets, macaroni, and chesse, pizza and fruit.
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.
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.
Since the end of Season 5, they have played the character Wyatt Matthew Halliwell on the TV series Charmed.
Jason is cautious and affectionate while Kristopher is wild and flirtatious.
An interview with their parents and the cast & crew of Charmed was in Xpose magazine isusse #87, June 2004, tittled: "Family Matters".
The twins did a commercial for Cargill Baby Food (2003).
They are half Ecuadoran, on their mom's side and they understand Spanish very well however they just don't speak it.
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.
Kristopher & Jason don't interact with the demons on Charmed, they get scared when they see them.
Their mother, Maria, was a fan of the show long before she ever got pregnant with them.
When Kristopher & Jason watch Charmed and see a scene with Wyatt they both think it's them in the scene.
Kristopher & Jason refer to the actors on Charmed by their characters' names. Example: Holly is "Mommy Piper" and Brian is "Daddy Leo".
Kristopher is younger by one minute at 6:23pm.
Kristopher has medium blonde hair and blue/green eyes (depending on what he's wearing).
Kristopher's Zodiac sign is Virgo.
Kristopher has half brother, Patrick, who is six years older.
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.