The Houston family is doing this in honor of Julia Cobb, or 'Ju' as they call her, who lost her life to Ewing's Sarcoma, a rare form of Bone Cancer, at just 8 years old.
"We cry a lot, we walk a lot, we eat less...sleep less," Jennifer said.
The Cobb's have had their share of heartbreak when it comes to Cancer.
Both Jonathan and Jennifer recently lost their mothers to the disease. Jonathan himself battled Cancer before having to tell his daughter Julia that she too would have to undergo treatments.
"My husband had to be the one to tell her that she had Cancer at the age of 6...and nobody should have to do that. So Ju was her nickname. And he told her the first 3 letters in Cancer are 'CAN.' And he said you do what you can do and let God do what you can't do," she said.
"Julia's response was quite extraordinary, there were no tears from Julia. She said 'You need to pray Dad and I'll do my part,'" Jonathan said.
The Cobb's say Julia fought for a year and a half and even got a stem cell transplant that was nearly a success...but the Cancer came back.
"One of the Doctors said 'You know, Julia never got a Make-A-Wish trip and I said 'no' and he said 'Well that's not okay. Let's send her on her Make-A-Wish.' So we ended up going to Walt Disney World in Orlando and we had the best week of our lives," Jennifer said.
At the end of the Cobb's 7 day trip to Disney World, Julia woke up with a high fever. Instead of going to the airport, they went to the hospital. Julia passed on within 24 hours.
"We then formulated a plan that we feel was God-inspired to walk across America with Ju's 'CAN' message and just inspire other people, raise awareness for very underfunded pediatric Cancer that only gets 4% of money raised in this country," Jennifer said.
In Julia's honor, the Cobb's started walking at Disneyland in Anaheim, California last August. Their final destination is Disney World in Orlando, Florida.
"I really hope we're that family maybe someone else will see and say 'Gosh they didn't give up, maybe I won't," Jonathan said.
"If that hasn't broken us, if we still can...so can you," Jennifer said.
You might be wondering how they're doing this with 3 little kids.
The Cobb's say they have a chase vehicle.
One parent will follow behind in their Suburban while the others walk.
They do 25 miles a day staying in donated hotel rooms and the kids are 'road schooled' as they call it.
The Cobb's hope to reach Disney World by the end of May or early June.
If you'd like to learn more about them and how to help, visit www.jucanfoundation.org