PORTLAND, Ore. (KOIN) — It’s been five years since second grader Kyron Horman disappeared from Skyline Elementary School. To mark the anniversary, his father sat down with KOIN 6 News to discuss what’s changed since that day.

On the morning of June 4, 2010, then 7-year-old Kyron walked into school, excited to show off his science project on the red-eyed tree frog. A photo of Kyron with a wide smile and black CSI shirt has kept him frozen in time — it was the last known photo ever taken of him.

But for Kyron’s father, Kaine Horman, June 4 is just another day.

“It’s not so much about June 4, necessarily. For us, it’s about the week after — June 12, July 10, August 2 — what are we doing on those days for him, in addition to living our lives with him integrated in,” Horman said. “So it’s still very much about what we have to do looking forward rather than any one given day.”

For the last 5 years, Horman has lived each moment believing his son will be found.

“I’d almost call it a belief,” he said. “Hope to me is good, but it’s also kind of uncertain.”

According to officials, Kyron’s stepmother, Terri Moulton-Horman, was the last person to see him alive. She reportedly dropped him off at school the morning of June 4, 2010. He wasn’t reported missing for another 6 hours.

Since Kyron’s disappearance there have been countless searches. The state launched its largest-ever search within hours of his disappearance. But where are the clues? Since that day, nothing has turned up.

“There’s still that theory that I have talked a lot about, and others have as well: He’s potentially either in the area with someone or even outside our area with someone else,” Horman theorized. “To me, as we continue to search, it rules out certain areas and it reinforces that belief.”

Horman said he believes his ex-wife, Terri Moulton-Horman, was involved in his son’s disappearance.

“I think a lot of people feel the same way through the evidence. Not through a gut feel, but what we know about polygraph failures,” Horman explained. “She has told us, straight out, she’s failed those tests. No, they’re not admissible in court, but in the general discussion of things, they’re perfectly admissible. I know there’s involvement, we’re not going to get help down that path. I’ve just kind of left that behind a long time ago.”

Then there’s Kiara, Kyron’s little sister. She just completed kindergarten at Skyline Elementary — the same school her older brother was the day he disappeared.

“It’s normal, I think not doing that wouldn’t have been normal,” Horman said. “To live in our community and not go to our school — the school is the center of our community, one of the main center points — we are very much immersed in our community. That is probably a hard topic for people in our community to openly embrace, but they embrace us through our attendance at school.”

Just last week, Multnomah County Sheriff’s Office announced a $50,000 reward for any information that leads to a resolution in Kyron’s disappearance. New fliers advertising the reward show images of what Kyron might look like today, 5 years since he went missing.