Remembering the Father I Never Met: A 9/11 Memorial

10 years after the tragedy of 9/11, children remember the fathers they lost

Gabriel "Gabi" Jacobs Dick, 9

Every year, Gabi sends balloons up in the sky filled with notes to his dad, sales executive Ariel Jacobs (who didn't survive the collapse of Tower 1), telling him what happened during the year. "Ten years since my first dad died on Sept. 11, I don't exactly know how to deal with it because I never really knew him," he tells PEOPLE.