A drive-by parade was organized to encourage a 5-year-old boy named Callen McDonnell.
He will undergo a bone marrow transplant in the near future to treat his second battle with cancer.
Callen's younger sister, Cora, will be his donor.
"She was exactly what he needed. We found out she was a 100% sibling match, which gives him the best case scenario...I've been struggling to find any hope, any faith since we found out that he got cancer again. Once we got that phone call, it...all rushed through my body, all of the hope that I needed, all of the faith that I needed," said Tori Sarlo, Callen's mother.
"I just hope that this shows that he knows he's loved and that he's got such a good support system behind him and that no matter what...he's going to get through this," said Ryan McDonnell, Callen's father.
For more information, check out the video above.