Police arrived to find a woman standing in the front yard, who told them her daughter had been killed by her son.
Police found the body of a woman in the hallway of the house, and a man's body in the back yard.
Police believe the son fatally shot his sister, then turned the gun on himself. A motive was not determined.
Five or six gunshots were heard, prompting the call to police.
The Associated Press contributed to this report.