A family's security camera captured the sweet moment a four-year-old boy headed to his crying sister's crib and reassured her everything's okay and that it's going to be a good day. The video was shared by mom Kristy Kusler, who watched on as her son Hunter headed over to two-year-old Madison's crib. There, Hunter leaned over and said, "Hey, Mad, we're not going to cry today," adding, "it's going to be a good day." He then reaffirmed the message: "Don't cry today. This is going to be a good day, Maddie." Kristy, from San Diego, California, has been working on a new business and was on a work call when Hunter informed her that Madison had started crying. The four-year-old assured his mom, "I'll go get her, Mama. I'm going to tell her it'll be okay." When Kristy then overheard her son upstairs, talking to his sister, she thought it was the sweetest thing and decided to rewatch the video. The moment took place on December 21, and Kristy later shared the clip online where is quickly went viral – which Kristy believed to be be down to the wisdom people see in childhood innocence.