If you call your sibling simply a brother/sister, how do you classify which the elder one is?
We actually do not emphasize who is the elder brother or sister. We will just say, "my older brother/sister." For example, I have two sisters, and I am the middle child. If I'm talking about my older sister, I say, "My older sister." If I'm talking about my younger sister, I say, "My younger sister." This is the same for others who have more than two siblings. They would use "older brother/sister" or "younger brother/sister." English does not have any classifiers added on like Korean, Chinese or Japanese. Ex: She has two older brothers: John and Charlie. Ex: My older sister Courtney is pregnant. Ex: Her younger brother James is a troublemaker at school.
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