My children attend PPS, so I am very familiar with the forms. The parents are listed first, along with their contact information, then there are up to 3 "emergency contacts" listed. I think that is where Desiree's info was. There is absolutely no indication that Kaine or Terri were not listed as "contacts" on his registration form.
DESIREE YOUNG: I got a phone call from the school, and she said, ‘Is this Desiree Young?' And I said, `Yes it is.' And she said, `You're listed as the emergency notification for Kyron Horman?' And I said, `Yeah, he's my son. What could I do?' And she said, `I have to notify you, he's missing.' And for a split second I thought it was a joke, and I said, `What?' She said, `He's missing.' I said, `I don't understand. How could he be missing?' I said, `OK, where is Terri and Kaine?' `Well, Terri's here.' `All right. Thank you.' And I hung up with her, and immediately called Terri, and I cussed a little bit, said, `What the hell's going on?' And she said that they went to the science fair and everything was fine and she waved goodbye to him, and he went into his class, or so she thought.
http://www.msnbc.msn.com/id/38420266