Meanwhile, Reed's sister, Mandi Ostein from Illinois, was feeling the distance and wanted to help. She began fundraising for the family. "It was the only thing she could do," he said.
The family had insurance, but they still needed help.
The cancer diagnosis came on top of Katie's pregnancy and the Sept. 28 birth of Aidan's brother Amry.
Reed, who works as a structural on-the-job trainer for aircraft company Cessna, had to take time off under the Family Leave Act, which has reduced his pay by 25 percent.
There were other financial pressures and the family cut out all frivolous spending so Katie Reed could stay at home with the two children.
"We burned through our savings, and because I was out of work, there were lost wages," he said.
The bills are not all in yet, but the Reeds calculate the deductibles alone are more than $1,000.
But none of that was on their mind when Aidan was at his worst. Aid for Aidan was "happening behind the scenes."
"We weren't thinking about our finances at all as people were gathering around to give us support," he said.
At first, they intended to see about 60 drawings, but the project grew.
Internet sites picked up the story and within a few days, Aid for Aidan had sold 2,000 of his drawings. At one point the site was shut down for a day because it was so overwhelmed with orders.
"I don't know if it was one thing [that appealed to buyers]," Reed said. "They see his cute face and the situation he is in and they feel compelled to help him. But others have told us it's the drawing themselves."
Comic book collectors and horror movie fans have flocked to the site. Tyler Mane, the actor who plays the fictional "Halloween" character Michael Myers, sent a signed photograph to Aidan's hospital bed. An mp3 player from his favorite character, Sponge Bob, is also on its way.
"Things like that help take his mind of what he's going through, and it makes the world a closer, smaller, warmer place for him," his father said. "It seems like a miracle, and we have a lot brighter outlook. So many people have done so much for our family.
"I feel like I was unhappy about how the world was against us, but a week later, I feel that half the world is in my son's corner," he said. "It's unbelievable."
Click here to look at or purchase Aidan's drawings.