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 his brother from the Tower before it was too late", but that, when the Duke of Buckingham became involved, it shifted to support of Henry Tudor because "Buckingham almost certainly knew that the princes in the Tower were dead." Alison Weir proposes 3 September 1483 as a potential date; however, Weir's work has been criticised for "arriving at a conclusion that depends more on her own imagination than on the uncertain evidence she has so misleadingly presented." Sir Clements Markham suggests the princes may have been alive as late as July 1484, pointing to the regulations issued by Richard III's