ARCADIA, Calif. (KABC) -- The 7 On Your Side Investigates team is uncovering disturbing details in police records as Arcadia police continue to investigate a couple that was suspected of running a surrogacy business out of their home, but it's unclear if they had any clients other than themselves.

Twenty-one of their children, many they had through surrogates, were put in the custody of L.A. County Children and Family Services. Now, police continue to search for one of their nannies, who is accused of abusing a 2-month-old who belongs to the couple.

According to court documents, photos were taken on May 7 of a then-2-month-old boy who Arcadia police say had "an apparent head injury."

According to warrants filed by Arcadia PD, the boy's mother is Silvia Zhang.

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