Ruben Castillo dangled for about 40 seconds before falling. Sophia Castillo believes her son, who was riding alone, panicked, and tried to climb out of the car.
She screamed at the operator to bring her son's car to the bottom, but he only spoke Spanish and didn't understand, she said.
Jared Costanza, from the advocacy organization Rideaccidents.com, said the boy should never have been allowed on the ride by himself, but did not blame the family.
"It's common sense that a 6-year-old child has no business riding alone on a 90-foot-tall ride that has no seat belts or restraints," he said. "People can blame the boy's parents or the ride operator because they should have known better, but the blame really lies with the industry, because they do know better. Yet there are no standards to prevent this from happening in the future."