Because they have no brothers or sisters, they do not have any kind of familial relationship with their family. This problem in English-speaking countries is not much different, but in some languages ​​there are many different names to call different relationships, even among children it is called younger brother or sister and brother or sister elder. And children who are part of a family with several children can always remember this. They can easily figure out which name is used to call their parents' younger brother or sister and which name is used to call their parents' older brother or sister because they have the same relationship with their siblings. Sometimes the different names will make someone growing up in an only child family very confused, and they will wonder why this person's name is different from that one, but they are siblings, or why they are both cousins ​​but have a different last name. . Even if someone tells them the reason, they will forget it very quickly, because they don't often have to touch this kind of relationship, and no one reminds them, and some family members will just show up once. or twice. in the same