 James Mor's brother Walter (executed 1425) left a son, Andrew Stewart, 1st Lord Avondale, who became Lord Chancellor of Scotland in 1459, and was one of the leading servants of King James III of Scotland.Little is known of James's life before the arrest of his father, the Duke of Albany, and his eldest son Alexander, for treason by King James I of Scotland on 21 March 1425, on the 9th day of the March parliament.The family properties of Doune Castle and Falkland Palace were captured, and Duke Murdoch and two of his sons were imprisoned and held pending trial.