What is the youngest doll short story about

A maiden aunt never marries because a river prawn bites her calf and, due to minimal treatment by her physician, nestles there to grow. She devotes her life to her nieces, making for them life-sized dolls on their birthdays and wedding days. When only the youngest niece is left at home, the doctor comes to see his patient and brings his son, also a physician. When the son realizes the father could have cured the leg, the doctor says, "I wanted you to see the prawn that has paid for your education these twenty years."