Sawyer will meet with nearly 40 families who lost husbands and fathers in the attacks.

Now, in a special edition of ABC News'20/20, she’ll revisit those families.

As those children approach their 20th birthdays, the special edition of20/20will bring nearly 40 families together again.

2020 Special Children of 9/11

Diane Sawyer with the families featured in the ‘20/20’ Sept. 11 special.ABC

“Has grief given them new purpose?

Are some following in their fathers' footsteps?”

the official synopsis reads.

“A master class in resilience and hope comes from a group forever bonded by a national tragedy.

The special edition of20/20will air Friday, Sept. 10, at 10 p.m. ET/PT on ABC.