Familial hypocalciuric hypercalcemia (FHH) is a group of autosomal dominant genetic diseases, which is characterized by persistent hypercalcemia, hypophosphatemia, hypermagnesemia, normal or mildly elevated serum parathyroid hormone (PTH) levels and low urinary calcium excretion.[1]. The gene discussed is PTH; the disease is familial hypocalciuric hypercalcemia.