Princes in the Tower household which stated: "the children should be together at one breakfast". James Gairdner, however, argues that it is unclear to whom the phrase "the children" alludes, and that it may not have been a reference to the princes. It may refer to Edward, Earl of Warwick (son of the Duke of Clarence) and Edward IV's two youngest daughters (Catherine and Bridget), all of whom were living under Richard's care at Sheriff Hutton. Other than their disappearance, there is no direct evidence that the princes were murdered, and "no reliable, well-informed, independent or impartial sources" for the associated events. Nevertheless, following
Princes in the Tower were under guard in the Tower of London, which was controlled by his men, and access to them was strictly limited by his instructions. He could therefore have dispatched one of his retainers to murder the princes on his behalf, but it is unlikely they could have been murdered without his knowledge. This is the version put forward by More and Polydore Vergil, who both name James Tyrrell as the murderer. Tyrrell was an English knight who fought for the House of York on many occasions. Tyrrell was arrested by Henry VII's forces in 1502 for supporting another Yorkist claimant