弟妇 refers to the wife of one's younger brother.
Think of 弟妇 as a sister-in-law, but specifically for your younger brother. It's like having a new family member who is married to your little brother.
儿媳妇 (ér xífù): This term refers to the daughter-in-law, the wife of one's son.
女婿 (nǚxù): This term refers to the son-in-law, the husband of one's daughter.
兄弟姐妹 (xiōng dì jiě mèi): This term refers to siblings, brothers and sisters in a family.
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