More families have come forward saying their children participated in inappropriate behavior during preschool hours at First Lutheran Church of Carson School.

Attorney Greg Owen said families for four girls and two boys have joined his lawsuit against the school, which is set to be filed Tuesday morning.

"Each and every child who has talked to their parent has the exact same story," Owen said.

After seeing the story first reported by Eyewitness News on Friday, the Los Angeles County Sheriff's Department launched an investigation into allegations of sexual activity among children at the school.

Parent Richard McCarthy said his 4-year-old son often received oral sex at school from a 5-year-old girl. Owen said there were multiple girls involved in the oral sex acts on multiple occasions.

Read More Here: Preschool Sex Case