No matter which one of Shireen's children attempted to become Bloodfyre's rider, they were met with indifference. In fact, Shireen had bore witness to one of the attempts, and it amused her to no end - Rickon heroically climbing atop Bloodfyre's neck, only for the red dragon to continue sleeping soundly, no matter how her son had urged, blustered, or shouted. Winterfell was rebuilt partly because many of the structures could no longer bear the rotund scaly frame of Bloodfyre; in fact, the Guest House's roof had collapsed just like that...