FRANK SILLER: 'I love you, brother' -- the 9/11 loss that inspired a mission of service

PROGRAMMING ALERT: Watch Tunnel to Towers Chairman and CEO Frank Siller discuss his new book "Let Us Do Good," on "The Five" on Sept. 1 on Fox News Channel at 5 p.m. ET.

There are moments in life that divide everything into before and after. For me, one of those moments came on September 11, 2001, when a firefighter calling from Ground Zero told me what I already feared but was not ready to hear: my younger brother Stephen was not coming home. In that instant, my family’s life changed forever, and so did the course of mine.