Watch: Trey Parker Uses His Daughter to Record Lines for Ike in SOUTH PARK
While Kyle's brother Ike has been voiced by several children over the years, in South Park's season 20 Ike has been voiced by Trey Parker's daughter Betty! I just assumed they used voice modulation on Ike's voice all these years and it was either Trey Parker or Matt Stone doing the voice! In the video below you'll see Betty (with the help of her dad) recording lines for episode seven, which is titled "Oh Geez".
It has to be a trip growing up knowing your dad is the creator of one of the most profane shows in television history! How could you ever get in trouble for the things you do?!