Okay, for clarity's sake, I found this from here, an article from June 5th from the Oregonlive:
http://www.oregonlive.com/portland/index.ssf/2010/06/details_emerge_about_the_day_k.html
~~~snipped contents for clarity and comparison purposes~~
"Horman, who has raised Kyron since he was an infant, snapped a picture of him standing in front of it that she later posted on her Facebook page. "
"He was so excited about his science project," said Carol Moulton, Horman's mother and Kyron's grandmother. "They had worked on it together. He was anxious to take it to school and show it off."
At 8:45 a.m. when the bell rang, Terri walked her stepson down the hall close to his class.
Carol Moulton said the kids were supposed to report to their classes and be divided into small groups of a few students each. Each group was supposed to tour the science fair with a chaperone. Afterward, when they returned to their classes for roll call, Kyron wasn't there, she said.
After leaving the school, Terri went about her day, running errands and taking care of household chores.
"Terri has raised Kyron," her mother said. "She's been with him since he was an infant. She's as much of a mom as the mom is because the parents had separated about the time that Kyron was born."
She said he visits his biological mother in Medford every couple of weeks and that Desiree, 38, came to Portland as soon as she heard about his disappearance.
Kyron was supposed to take the bus home Friday, so Terri went to the bus stop at 3:30 p.m. to pick him up.
But the bus driver told her he wasn't there.
Panicked, she ran home and called the school to discover that he had been marked absent for the day.
She called 9-1-1, setting off a search that's drawn in a swarm of officers and several law enforcement agencies, including the FBI."