Peyton Manning reached out to Chad Carr's family after Carr's death

Peyton Manning has long been known for his work with terminally ill children -- so much so that a children's hospital in Indianapolis was named after him.

The stories about what Manning has done for people who are sick or dying, both child and adult, continue to pop up, and another one showed up after Manning and his Denver Broncos beat the New England Patriots on Sunday to reach Super Bowl 50. The family of Chad Carr, the grandson of former Michigan coach Lloyd Carr who died in November after a very public battle with an inoperable brain tumor, shared a letter Manning sent them less than a month after Chad's death to tell them how much Chad's story meant to him.

Part of the hand-written letter said, "I watched the ESPN special on your son Chad. His courage and fighting spirit is inspirational."

In their Instagram post, the Carr family thanked Manning for taking "the time to write us a personal note after Chad passed away. Sad for Tom [Brady] but happy for Peyton. It's bigger than a game, and we are grateful that they are both."

Chad Carr's story became well-known nationally, with an ESPN feature on College GameDay that ran days after his death. Both Michigan State and Ohio State -- Michigan's biggest rivals -- wore decals on their helmets to honor Chad during the annual football game between the two schools. The decals showed the ChadTough hashtag that had become synonymous with his cause.

The Michigan State and Ohio State basketball coaches decorated Carr's house with Christmas lights in November, after Chad went into hospice care.

While Chad was fighting pediatric cancer, his story resonated nationally on social media and with stories on "Today" and "Good Morning America," including his receiving his own superhero fight song.