From above link, on first reading I thought it sounded like the 17 year old might be at the hearing. But then I read the entire article and it's just talking about it detectives. They aren't even sure if the children will testify later.
"Hestrin has said he plans to have some of the children testify against their parents if a trial is held.
“The children might actually benefit from testifying as it may allow for some sort of catharsis for them and help with some closure,” Trujillo said.
The decision to have the children testify shouldn’t be taken lightly, Levenson said.
“Experts need to weigh in on whether it’s better for them to testify and get their story out, whether it will be more healing than harmful,” she said."
Turpins unlikely to get short sentence with any plea deal, experts say – Press Enterprise