How do fortune tellers know how many people there are in a stranger's family?

There are several possibilities: 1. It is said that there are many schools of fortune telling in Jianghu. Some fortune tellers use some skills to understand the population of your family by asking questions from the side or talking with the victims. 2. In Yi-ology, Eight Diagrams or Numerology, there are many analyses about six relatives, all of which are some experiences gained through long-term practice. Although these theories have not been completely scientifically proved to be credible, some of them conform to some laws, so you can calculate how many people there are in your family; 3. None of the predictions can achieve 100% accuracy, depending on the level of fortune tellers, hehe.