BRANTLEY COUNTY, Ga.--Seven-year-old Aiden McCullough and his 20-year-old sister, Morgan Smith, are very close.
"I love my sister a lot," he says.
Now, their bond is unbreakable.
"That's my hero. My angel. My brother," Smith says.
The siblings were swimming in the pool at their home in Brantley County, Georgia last week when Smith suddenly had a seizure. "I was thinking like 'oh my God, oh my God. She's going to die,'" McCullough says.
Aiden says his instincts kicked in. He grabbed his sister's hair and held her head above the water.
"I would've drowned," says Smith.
There is a picture of the siblings embracing each other after the horrifying incident. Smith says her brother is brave. "I know that there are real life angels because I'm lucky enough to call him mine. I have an every day superhero in my life."
Aiden is embracing his new role as a real-life superhero.
"Do you think you're a hero? he's asked. He answers: "Yes, I do."
Smith says she's thankful Aiden was in the right place at the right time and ready to step in to help when she needed her little brother the most. "I love you and you are forever my hero and every day I'm only more thankful that I get to call you my little brother. Sissy always loves you."
"I love you always, too," her brother said.