I saw on the news that the 14-year-old sister hated her parents’ eccentricity and killed her 9-year-old sister. The sister, who was a left-behind child and now drops out of school, said she hated her parents’ eccentricity and that killing her sister was equivalent to “digging the flesh of her parents’ hearts” and felt very relieved. It must be said that this is a tragedy of human ethics, but the deep-seated reasons behind it are thought-provoking. The more the age difference between siblings, the less likely they are to form a competitive relationship. 14 and 9 years old, a difference of 5 years, is quite a lot. Therefore, in this case I think it is more important to draw attention to how parents respect each child’s mind (effective parent-child communication) and how to avoid the problem of staying behind. As the saying goes, ten fingers are not the same length. As a parent, it is sometimes hard to avoid being fair in everything. However, parents should try to understand the psychological needs of each child. Even when asking “the older one to let the younger one” or “the younger one to listen to the older one”, it is important to communicate with your child why you are doing this. It is important to take the child’s concerns seriously. Although born of the same mother, children may have completely different temperaments, so different children may express their problems differently. Some children are articulate and articulate, some are good at venting so that parents can quickly find the problem, and some are quiet, but parents may not really understand his thoughts. So children with little or no parent-child communication are prone to behavior problems. Also, left-behind children are to be avoided as much as possible. Although sometimes parents have to run the future, run to earn money, the children in the old home to less drag, but a long stay, will affect the child’s education and parent-child relationship, this loss is more money can not make up. Among the people I know, there are those who foster their children in their hometowns for doctoral studies, and those who are separated from their children for a long time for a better job position, which I think has an impact on their children’s growth. This sister, being introverted, and the fact that the sister did not grow up living with her parents and did not know how to communicate well with them, so they did not understand her bitterness towards them for being biased, was a major cause of the tragedy.