Since they have no brothers or sisters, they do not have any kind of familial relationship with their families. This problem in English-speaking countries does not have too much difference, but in some languages ​​there are many different names to call different relationships, even just among children they call the younger brother or sister and the older brother or sister. And kids who are part of a family with multiple children will always be able to remember them. They can easily understand what name is used to call their parents' younger brother or sister and what name is used to call their parents' older brother or sister, because they have the same relationship with their siblings. Sometimes different names create a lot of confusion for those growing up in a family of only children, and they will wonder why this person's name is different from that one, but they are brothers, or why they are both cousins ​​but have a different last name. Even if someone explains to them the reason, they will forget it very soon, because they don't have to touch this kind of relationships much, and no one keeps reminding them, also some family members will only show up once or twice in the same