Marano said other children were in the home at the time, but no one else was hurt.
"It's very difficult,'' Shaffer said, "but I have to also consider, What if somebody else had been shot rather than her grandson?
"I realize that the death of her grandson is something she's going to have to live with the rest of her life,'' the prosecutor said, "but in any community, this is possible if people aren't responsible gun owners.''
Shaffer said the boy's parents will have input at some point, as would any victim's family.
He said he won't present the case until September to give the family time to pay their respects and bury the child.
Neither Jarvis home has a published telephone listing.