How many grandsons did Lu Xun have?

Lu Xun has three grandsons and one granddaughter. Lu Xun only had one son, Zhou Haiying, who was born in 1929. It is said that when Zhou Haiying was born, the mother showed signs of dystocia. The doctor asked Lu Xun whether to keep the child as an adult or to keep the child. Lu Xun said directly: "Keep the adult alive." The result was surprising, and the mother and child were safe.