They were the smallest victims of 9/11 – not yet even born when they lost their fathers on Sept. 11, 2001.
Today, they are bright and hopeful 9-year-olds who only now are beginning to understand their unique legacy. Their resiliency is proof that life goes on.
"This is something the whole world felt," says Jill Gartenberg Pila, whose daughter, Jamie, was born six months after 9/11. "As Jamie gets older, she realizes the loss she had was also a loss that affected everyone."
In many ways, they are typical fifth graders who skateboard, play video games and worry about schoolyard crushes.
Yet they are far from ordinary.
Gabriel Jacobs Dick, 9, releases balloons every 9/11 with messages for Dad to "give him an update on how life is going," he says. "Mostly it's like, 'I miss you.' "
For an in-depth look at the children of 9/11, including Father's Day photographs and interviews in their homes, pick up this week's issue of PEOPLE, on newsstands Friday