Smith broke down in tears at the podium after Cleveland's 93-89 Game 7 win over the Golden State Warriors.
He discussed the impact his family has had on him after plenty of rough moments throughout his career.
Fox Sports Ohio provided a clip of the former Sixth Man of the Year at the podium:
Afterward, the press applauded Smith, which Zach Harper of CBS Sports said was unprecedented:
SLAM Magazine captured an image of Smith sharing the moment with his father on Father's Day:
"Everything I do is for my parents and for my family," Smith said, per SportsCenter.
He has had many off-court issues throughout his 12-year career, but Smith showed fans a different side of himself Sunday.
He admitted he's messed up but has been fortunate to have the support of his family.
"I've been in a lot of dark spots in my life," Smith said, per Fox Sports Ohio. "If it wasn't for them, I wouldn't be able to get out of them."
Smith has gone from troublemaker to a key contributor on an NBA championship team, and that will never be taken away from him.
"If it wasn't for the structure and the backbone that I have," Smith said, per Fox Sports Ohio, "I wouldn't be able to mess up and keep coming back and being able to sit in front of you as a world champion."