John Tlumacki/Globe Staff
Sydney Corcoran (left) and her mother, Celeste, shared a moment together in Sydney's room at Spaulding Rehabilitation Hospital, a day before her discharge. Celeste lost both legs in the first bombing. Sydney’s femoral artery was severed from a piece of pressure-cooker shrapnel, and she nearly died from blood loss. Celeste, her husband, Kevin, and Sydney were standing on the sidewalk of Boylston Street near the finish line to root for Celeste's sister, Carmen, who was running the Marathon.