Three others also were indicted Friday in the slaying while a fifth person was charged with burglary and theft.
Two of the five charged are teens.
The Pickaway County Sheriff’s office said Thomas Whitson, 84, was found dead at his home last weekend after what appeared to be a robbery.
Investigators said they recovered several firearms that were missing from Whitson’s home in Orient.
Charges against Whitson’s grandson include aggravated murder, aggravated burglary and grand theft.