The teen is facing capital murder charges in the deaths of Chester and Sandra Bienek.
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The couple, both 72-years-old, were found shot to death in their bed on October 18.
But police believe they were actually killed two days earlier.
RELATED: Authorities: 14-year-old is 'person of interest' in slaying of grandparents
Teenager questioned in the murder of elderly couple in Beach City
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Authorities have yet to offer a motive for the killings.
At a detention hearing for the grandson this week, the judge ruled the teen must remain at a juvenile facility in Hardin County.
No trial date has been set.