Sisters Ryan, left, and Casey McGowan sit beside the stone honoring their mother on the Boston College campus in Boston on Sept. 4, 2015. Their mother, Stacey Sennas McGowan, was killed on during the attacks on the World Trade Center on Sept. 11, 2001, in New York.
Sisters Ryan, left, and Casey McGowan sit beside the stone honoring their mother on the Boston College campus in Boston on Sept. 4, 2015. Their mother, Stacey Sennas McGowan, was killed on during the attacks on the World Trade Center on Sept. 11, 2001, in New York. Jonathan Wiggs The Boston Globe via AP
Sisters Ryan, left, and Casey McGowan sit beside the stone honoring their mother on the Boston College campus in Boston on Sept. 4, 2015. Their mother, Stacey Sennas McGowan, was killed on during the attacks on the World Trade Center on Sept. 11, 2001, in New York. Jonathan Wiggs The Boston Globe via AP