Stephen had at least four brothers and one sister, along with two probable half-sisters. His eldest brother was William, who under normal circumstances would have ruled Blois and Chartres. William was probably intellectually disabled, and Adela instead had the counties pass to her second son, Theobald, later also Count of Champagne. Stephen's other older brother, Odo, died young, probably in his early teens.
Stephen had at least four brothers and one sister along with two probable half-sisters. His eldest brother was William, who under normal circumstances would have ruled Blois and Chartres. William was probably intellectually disabled and Adela instead had the counties pass to her second son, Theobald later also Count of Champagne. Stephen's other older brother, Odo, died young, probably in his early teens.