Madison Elle Beer was born on March 5, 1999, in Jericho, New York, an affluent hamlet in Nassau County on Long Island. Her parents, Robert Beer and Tracie Beer, are both American citizens who built their lives and careers in the region. Robert worked successfully as a luxury home builder and general contractor, while Tracie established herself as an interior designer before later assisting Madison through the early stages of her management and public career.
The family household was steeped in Long Island Jewish culture. Madison grew up alongside her younger brother, Ryder, navigating public school and suburban community circles before social media fame altered the family's trajectory. Her parents divorced when she was seven years old, an experience that Madison has spoken about candidly in her 2023 memoir, The Half of It, yet both parents maintained active, collaborative involvement in her upbringing and creative ambitions.