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

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

Allison Lee, 9

For show-and-tell last year, Allison brought in a snow globe of New York City and told her classmates about her father, 34-year old stagehand Dan Lee. "I told them my dad's plane crashed into the Twin Towers," Allison told PEOPLE. "I was nervous but it made me feel better." Allison now lives in Henderson, Nev., and always sends a card to her dad on his birthday.