Cheryl Rex, mother of Lance Cpl. Dylan Merola: "When [Biden] approached me, his words to me were, 'My wife, Jill & I, know how you feel. We lost our son as well and brought him home in a flag draped coffin.'" "My heart started beating faster & I started shaking, knowing that their son died from cancer & they were able to be by his side." "How could someone be so heartless