Both men died of gunshot wounds.
The sheriff says 74-year-old Daniel Garcia entered a room in the house and started shooting at his 24-year-old grandson, Donald Ray Crawford III.
The sheriff says Jodie Lynn Crawford stepped in to stop Garcia, her father, from shooting her son.
At some point, the sheriff says the father -- Donald Crawford Jr. stepped in to help his wife stop the fight.
Crawford, who lived in Wagoner County Oklahoma, not far from Tulsa, the site of the Chili Bowl, won the Chili Bowl Rookie of the Year award in 2007. Jodie Crawford was also wounded in the dispute, suffering a gunshot wound to the hip. Garcia was previously arrested in 2004 on charges of assault with a dangerous weapon.
In honor of Donnie Crawford, tonight's Chili Bowl A-Main feature will be extended five laps to 55 laps. 55 was Crawford's car number. Our condolences go out to the Crawford family.
