A 7-year-old Ridgeville girl whose infant brother was fatally mauled earlier this year told counselors she saw her mother and father engage in a sexual threesome with a woman and she viewed homemade pornographic films of her parents, according to a Dorchester County Sheriff's Office incident report obtained Friday.

Chantel and Quintin McGrew’s daughter relayed the accounts to a worker at a Summerville facility that counsels children involved in traumatic experiences.

The girl also told the children’s center worker that “she had engaged in inappropriate acts with another unknown juvenile,” according to the report. She did not say when the incidents occurred.

The revelations prompted state officials to remove the girl and the McGrews’ 2-year-old son from their Sandpit Drive home for the second time since the newborn’s death.

Quintin McGrew, 28, faces a charge of unlawful conduct toward a child in the dog mauling incident on April 20. Investigators said he was sleeping when the family’s Labrador retriever mix snatched 2-month-old Aiden from a bouncy swing.

Chantel McGrew, 23, and her daughter returned home to find Aiden bloodied and missing a leg.

The S.C. Department of Social Services took the two surviving children into protective custody, but they were returned to the couple June 14.

The new allegations, recorded Thursday in a report filed by the Dorchester County Sheriff’s Office, did not immediately result in arrests. Chief Deputy Sam Richardson said only that the case was under investigation, and he declined to comment further.

Attempts Friday to contact the McGrews and their attorney, Andy Savage of Charleston, were not successful. Savage’s assistant, Heather Hill, said her office was not aware of law enforcement involvement with the case.

The Sheriff’s Office was called Thursday afternoon to the Dorchester Children’s Center on East Richardson Drive in Summerville, where the children had been undergoing therapy after their brother was killed.

A worker told deputies that the McGrews’ girl spoke of being exposed to sex acts and pornographic videos. The girl did not speak directly with the authorities.

“The victim reported that she had observed (her parents and another woman) having sexual intercourse with each other,” the report stated. “The victim advised that she watched more than one video of Mr. and Mrs. McGrew having sexual intercourse.”

The other woman involved in the alleged group sex was not fully identified.

The 7-year-old girl and her brother were placed with DSS through a “safety plan” before the Sheriff’s Office was notified, the report stated. A DSS representative acknowledged to the deputy that the agency had opened a case about the McGrew children, but that law enforcement officers had not been contacted.

Reached Thursday, DSS spokeswoman Marilyn Matheus would not discuss specifics of the case, but she said the McGrews were “cooperating in providing for the safety of the children.”

Reach Andrew Knapp at 937-5414 or twitter.com/offlede.