(CNN) -- A man suspected of killing four children and two adults in Spring, Texas, was not the children's father, a constable said Thursday morning.
Earlier, a Harris County sergeant said that suspect 34-year-old Ron Lee Haskell was the slain children's father.
Constable Ron Hickman clarified Thursday morning that authorities believe Haskell had been married to a relative of one of the home's residents.
A seventh person, a 15-year-old girl, was critically wounded and taken to a local hospital.
Officials didn't say what prompted the shootings. Haskell is separated from his wife, who lives out of state, authorities said.
Officials: Prepared to take more lives
Haskell is accused of killing two boys, ages 13 and 4, and two girls, ages 9 and 7. The adults who were fatally shot were a 39-year-old man and a 33-year-old woman. His relationship to the adults wasn't immediately clear.
Authorities believe the suspect was prepared to take the lives of other relatives who lived nearby.
"Grandparents were also targets of him," Gilliland said. "Fortunately, they were brought out of the house before that could happen, and we would have had more tragedy."
Gilliland said the suspect faces multiple charges of capital murder.
The suspect was taken into custody after a three-hour standoff that followed a short chase with sheriff's deputies.
"The sheriff's hostage negotiators have successfully resolved this," said Harris County Constable Ron Hickman. "He's removed from the vehicle without incident."
During much of the standoff, Haskell held a gun to his head, while deputies surrounded him with their weapons drawn.
The shooting took place in Spring, about 20 miles north of Houston.
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