As part of New Hampshire-based C&S Wholesale Grocers Inc.'s acquisition of Houston's Grocers Supply Co. Inc. — the city's largest private employer and parent company to well-known retail brands — the retail businesses will not change hands and stay under ownership of the Levit family, said Mike Nichols, COO at Grocers Supply. "C&S Wholesale is not acquiring the retail operations owned by the family that includes Fiesta Mart, which has 60 stores," said Nichols. "The retail operations will stay…