Lucas Ryan Stephenson died Thursday evening at IU Health Bloomington Hospital from injuries he suffered when the horse stepped on the youngster after he fell.
The boy's maternal grandfather, Steven R. Crowe, Route 6, Bloomfield, told the Greene County Daily World that about 30 people had gathered at his 120-acre farm for a Thanksgiving Day celebration.
The family had just eaten its holiday dinner when several of them went outside to enjoy a horse ride about 3 p.m.
Crowe says his grandson and the boy's cousin were on a horse that was being led by an adult when events turned tragic.
"The horse jumped and there was two of them riding it. They both fell and the horse came down on one (Lucas)," Crowe said.
The other youngster was not injured.
"I never seen anything like it. We grew up around animals and horses all of our lives. The horse was being led by an adult. It had a saddle on it. It was an older horse that had been ridden for years," Crowe explained, " I just don't know what happened. It doesn't make sense."
Lucas was the only child of Jake and Stephanie (Crowe) Stephenson of Bloomington.
He attended the Little Whippersnappers Preschool in Bloomington.
According to his family, Lucas loved his John Deere tractor, all big tractors, bulldozers, farm combines and all things powerful. He loved his "baby cow," horses, cows, was crazy about his dog and loved to be out of doors and playing.
Funeral service was conducted Monday morning at Allen Funeral Home in Bloomington. Burial followed at Walnut Grove Cemetery in Greene County.
The family has requested that memorial contributions be made to Riley Hospital for Children in Lucas' memory in care of the funeral home.