Sitric married an unnamed sister of Æthelstan in 926. Historians generally describe her as Æthelstan's only full sister, but Maggie Bailey points out that this rests on the late testimony of William of Malmesbury, and the "Anglo-Saxon Chronicle" makes no such distinction when recording her marriage to Sitric. William did not know her name, but traditions first recorded at Bury St Edmunds in the early twelfth century identify her as Saint Edith of Polesworth. The truth of his identification is debated, but regardless of her name it is likely that she entered a nunnery in widowhood. According to some late sources, such as the chronicler John of Wallingford, Amlaíb Cuarán was the son of Sitric and this West Saxon princess.