Douglas was connected to two of the Guardians : James Stewart , 5th High Steward of Scotland was his brother - in - law .
Alexander Comyn , Earl of Buchan was a brother - in - law of Eleanor de Lovaine .
Douglas was connected to two of the Guardians : James Stewart , 5th High Steward of Scotland was his brother - in - law , and Alexander Comyn , Earl of Buchan was a brother - in - law of Eleanor de Lovaine .