Man killed and children injured after grenade detonation in Indiana home

A man died and his two children were injured after an explosion in their Indiana home caused by a grenade found in a relative's belongings.
The man's 14-year-old son and 18-year-old daughter suffered shrapnel wounds and were hospitalized.
The grenade detonated when someone pulled the pin, but authorities have not determined who did so.
A bomb squad secured the area and investigated for additional explosives.
The incident occurred in Lakes of the Four Seasons, Indiana, and authorities are investigating how the relative obtained the grenade.