Family members aren't sure what happened Sunday to cause a plane crash in Stockbridge that left a man and his granddaughter seriously injured, but they are thankful their relatives are alive.

Jamie Thompson and his 8-year-old granddaughter London were headed back to Cherokee County when Thompson’s Cessna 150 crashed into trees while trying to land in a field near Millers Mill Road, the Henry County Fire Department said.

Thompson, an experienced pilot, took London out for trips all the time, wife Jennifer told Channel 2 Action News.

“They do everything together when she’s here and when he’s home from work,” she said.

Thompson did all he could to save his granddaughter before first responders arrived, Channel 2 reported.

“He was trapped inside the plane and he was twisted because he was trying to get her out,” Jennifer Thompson told the station.

Corey Smith witnessed the crash and rushed to save them, Jennifer Thompson said.

London was flown to Children’s Healthcare of Atlanta with broken bones in her lower body, Channel 2 reported. She is now in a wheelchair.

Thompson was treated at Grady Memorial Hospital for broken bones and head injuries. He was released Monday.

The family said neither remembers what happened after the crash, Channel 2 reported. Relatives said the family dog was killed in the crash.

The Federal Aviation Administration and National Transportation Safety Board are investigating the cause of the incident.