One of the most unusual pieces of trivia regarding the Disick family line is the exact five-year split between Mason and his younger brother Reign. Both arrived on December 14, an astronomical coincidence that initially led internet skeptics to question if the deliveries were planned.
Kourtney addressed the matter repeatedly on talk shows, clarifying that Reign arrived naturally on his brother's fifth birthday without an elective induction. The shared anniversary has shaped the family's annual celebrations. For years, joint birthday themes accommodated a toddler and an elementary schooler simultaneously. As Mason reached adolescence, the dual celebrations evolved: intimate daytime dinners with close friends gave way to private family gatherings honoring both brothers separately.