In other countries, Stefan said, parents often don't learn their children have cancer until it's too late.
The International Union Against Cancer estimates that 80 percent of children with cancer live in developing countries, and more than half eventually die.
The Jessin's know youth cancer first-hand. Their son Liam was diagnosed with Leukemia when he was three, and was treated successfully. The family is now traveling to bring that hope to others.
The Jessin's have been global travelers for a long time — originally, they're from France.
The kids are homeschooled in car as they go. Lydie was a teacher before they hit the road.
The Jessin's sold their home, two cars, motorcycle, camper, furniture, and some toys and clothes to pay for their trip.
“We sold everything,” said Stefan.
But even that isn't going to be enough with gas prices the way they are.
“We estimated the cost 2 years ago,” Stefan said. “We know already that we're going to have to shorten the trip to two years instead of three.”
It's not as if the family is traveling in luxury either. The Jessin's don't stay at campgrounds, instead spending the night in Wal-Mart and restaraunt parking lots.
“We don't have the budget to go to the camping areas,” Stefan said.
They've had a tough time finding places to load the RV up with water.
Lydie has had some kidney problems from the lack of it. She said they have been filling the tanks every three days.
“It's tough to go three days with six persons,” Lydie.
Overall, they said the journey has gone well thus far, though Lydie said the trip down the Big Horn Mountains was a little harrowing in the RV.
“We could smell the brakes,” she said.
Lydie and Stefan said Wyoming was beautiful, but were shocked to learn the state is having a relatively wet season.
“Even Texas is greener than this,” Stefan said.
For more on the Jessin's and their trip, visithttp://www.milesofhope.net.