Born Caspian Harper Brown, he is the youngest in a family of four featured on the YouTube channel Slyfox Family. His parents created a side channel for him called Cas's Corner.
He first appeared on YouTube in the family's "Our First Family Vlog Ever!!!" video, which was posted on Christmas Day in 2015.
He modeled his parents' "Girls Are Cool" t-shirt for Slyfox Threads.
Missy Lanning was featured on the Slyfox Family channel in a video called "The Poopy Diaper Challenge."