Sign up for the TODAY newsletter

You have successfully subscribed to the TODAY newsletter.

Subscribe now and get trending stories, celebrity news and all the best of TODAY.

Sibling love: Big brother, 5, greeting little sister, 3, will melt your heart

"They walk home arm and arm saying things like, 'You're my favorite person.' 'Thanks. You're my favorite person, too,'" their mom wrote on the TODAY Parenting Team.

Best of TODAY

Play All