In the debut episode of "Behind Sibling Lines," siblings Kelvin and Baeba dive into the chaos of their shared childhood. From re-enacting dramatic Lion King scenes to Kelvin's grandpa teaching tough life lessons, they explore the moments that shaped their sibling bond. They also test their millennial knowledge with a soundbite game. And, of course, they give their youngest brother, Korbin, a hard time for his last-minute cancellation.