Willow River Farms, a private group home for the mentally retarded and physically disabled in Brookshire, turned into a place where "residents would gather in groups and have sex with multiple partners at the same time," and the atmosphere was described as "one big orgy" by a former employee, according to a lawsuit recently filed in Harris County. The suit, filed by Houston attorney John Ramsey, focuses on the alleged sexual assault of a 42-year-old mentally retarded woman. "The more the family