Each of the children are in separate categories, so those in wheelchairs participate with others in wheelchairs, but she most are amputees.
"He decided he wanted to run track, but his walking legs wouldn't let him run in the racing part," she said.
Running blades were donated to Cooper just two weeks before the family left for Oklahoma. Because only walking legs are covered under insurance, it would be difficult for the family to buy another set of legs, which run about $25,000 to $30,000. So for two weeks, he practiced with his newfound running legs.
That practice paid off. He took home the gold in the 20-, 60-, 100- and 200-meter in his division. That regional competition sprung him into even more opportunity.
They met a family from Mississippi at the games who said they thought Cooper might do better with a pair of Cheetah legs, which are more for sprinting.
Just three weeks ago, the Glen Dale family flew to Mississippi to pick up the pair donated to them and made by the same person who created Oscar Pistorius's prosthetics. Cooper had aspired to be like Pistorius — an amputee who competed in the World Championships — until Pistorius' recent murder charges for his then-girlfriend.
"Cooper really wanted to be like Oscar, unfortunately. He was a big fan, so it was very surprising," Richelle said.
Equipped with new legs, Cooper is yet again practicing for his upcoming triathlon and the next round of Endeavor games, which will lead him to the national competition in Minneapolis. If he qualifies at nationals, he can qualify for the world competition in Italy.
"If he keeps doing this year after year, when he reaches the right age, he can go to the Paralympics," Richelle said. Participants must be 15 years old, she said.
"He hopes to run in the U.S. Paralympics ultimately. He wants to be part of the U.S. track team, and he's gotten very close to a runner who was a silver medalist. He's become a mentor and a great friend."
"He constantly amazes me. We were sitting in the hospital all those years ago worrying about what he won't be able to do," she said. "But he doesn't look at himself as being different. He's perfectly happy with who he is."
His confidence has helped him not only athletically, but also as a typical nine-year-old.
"Being a kid, I was worried he'd get made fun of. But kids at his school just love him. Every time he gets new legs, it's like he's a transformer," Richelle said.
"He has to change clothes for gym class, and I wanted to go there and help him because he has to take his legs off, then get dressed, then put them back on. It's a process. But he adapts well."
"It doesn't bother him. When we're out, people will ask questions, and he answers them — 'They're my prosthetics; I don't have any feet,' " she said.
"One day, I had to come to the school because his foot came off — a screw came out. I thought he was going to be upset, but he thought it was funny," she said.
"Since he's been born, he's been the type of kid that if you say he can't do something, he's going to prove you wrong. He's got that drive. If we see a climbing wall, we're going to be there for a while because he's going to climb it until he reaches the top. And he's taught me a lot, too. He doesn't complain. I look up to him as my hero."