Grandma could only advise again, “It’s just a concubine. Before the mistress enters the door, she drinks a decoction to prevent pregnancy. After a few years, when the master and the husband have given birth to an eldest son, she will leave, so why should you quarrel with Fourth Master over this”,"My parents have both passed away, and I am the only one left besides my elder brother, who was exiled to the border as a soldier.","Don't worry, elder sister. The younger one will definitely not let you down."。