It seems like young kids don't always understand things like sickness, disease, cancer or death. But what many of them do understand is friendship. And these two first graders are the best of friends.

When young Zac was diagnosed with leukemia, his best buddy Vincent wanted to make sure that Zac knew he was there for him. In more ways than one. Everyone should be so lucky to have a friend like Vincent. Your heart will melt when you see what he does to support his sick friend.