OK, I did a little digging. Here's a list of all the kids Gibb's has helped.
If I missed any, let me know & I'll update the list.

YI included Kelly, because she is important to the storyline.Y -- and the "Little Angel" just because.

SEASON - 1
"Hung Out to Dry"
BILLY'sfather dies, Gibbs helps finish the tree-house his dad was helping him build. Mother living.
Actor: Austin Noah Marquez

SEASON - 2
"See No Evil"
SANDY, who is blind,& her Mom are kidnapped.
Actor: Abigail Breslin

SEASON - 3
"Honor Code"
ZACH's father, a cryptologist,is kidnapped. Mother is dead. Zach is Gibbs' "Mini-Me"
Actor: Joseph Castanon

"Light Sleeper"
BabyDawson: Mother disappears & Gibbs has to find her.
Actor's name not given.

"Bait"
KODY: A distraught teenager says he has a bomb & takes over a school room.
Actor: Michael Welch

"Hiatus 1 & 2"
KELLY: Appears in dreams, nightmares, and flashbacks.
Actor: Mary Matilyn Mouser

SEASON - 4
"Escaped"
EMILY Fornellis threatened by an escaped convict.Gibb's helps Fornell track him down.
Actor: Payton Spencer

"Witch Hunt"
SARAH: Kidnapped on Halloween.
Actor: Kali Majors

"Angel of Death"
Little Angel:Young girl appears throughout the episode.
Actor: Samantha Bailey