A joint undercover investigation revealed a Lynbrook mother and her son peddled oxycodone and suboxone, Nassau County police said.

Working with the Lynbrook Police Department, Nassau’s Narcotics/Vice Bureau found that Geraldine King, 57, and her son, Robert A. King, 24, both of Rocklyn Avenue, “participated in the sale of oxycodone and suboxone,” police said in a news release.

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They were arrested on felony drug charges Wednesday at their home and arraigned Thursday at First District Court in Hempstead.

Robert A. King is charged with two counts of third-degree criminal possession of a controlled substance; one count of fifth-degree criminal possession of a controlled substance; two counts of third-degree criminal sale of a controlled substance; and one count of fourth-degree criminal sale of a controlled substance.

His mother is charged with one count of third-degree criminal sale of a controlled substance and one count of third-degree criminal possession of a controlled substance.

Each was arraigned Thursday and ordered jailed; bail was set at $10,000 cash or $20,000 bond.

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Both are due back in court on Monday, according to court records.