SACRAMENTO, Calif. -- A child was found alive Monday inside a South Sacramento home with four slain bodies, the sheriff's department said.

According to the Sacramento County Sheriff's Department, a relative arrived at about 10:40 a.m. to check on residents at a home in the 8700 block of Rooster Way.

Ying Moua, his wife and two children were found with gunshot wounds to the torso, the sheriff's department said.

Sgt. R.L. Davis, of the Sacramento County Sheriff's Department, said investigators had not determined whether the case might be a murder-suicide or if the victims had been shot by someone who had fled the scene.

"We literally have no idea, right now, if there is a suspect out there," Davis said. "We don't know who did this."

Some family members of those found dead in the home told KCRA 3 that they think the deaths were either a murder-suicide or a consensual suicide -- a family pact.

Moua's sister, May Her, said the only warning they received was when her brother called their mother and asked her that if he went to jail if she could take care of his children.

Firearms were found inside the house, but it was unclear if any of them had been used in the shootings.

The surviving girl, who was found with a gunshot wound to the head, was sent to UC Davis Medical Center in Sacramento.

Meanwhile, investigators combed through the one-story home in search of evidence and a possible motive.

The sheriff's department said they had been at the home at the request of Child Protective Services for a welfare check.

Teng Veng, who said he knows the man who owned the home, told KCRA 3 that three young children and a teenage step-daughter lived at the home.

Veng said the teenager didn't get along with the father who owned the home.

Meanwhile, Moua's family members said the teenage step-daughter was removed from the home and placed in protective custody last week after a visit from Child Protective Services.