Japanese Family Vocabulary: In-group vs Out-group Words Explained
Japanese family vocabulary contains one of the most important concepts in the language: the distinction between in-group (内, uchi) and out-group (外, soto). Japanese culture draws a clear line between your own group and others'. When speaking about your own family, you use humble, plain terms to show modesty. When speaking about or to someone else's family, you use respectful forms with the honorific お/ご prefix.
Getting this wrong is one of the most noticeable errors a Japanese learner can make. Saying お父さんは医者です when talking about your own father to someone outside the family sounds immodest — as if you are elevating yourself. The correct form is 父は医者です.
The Complete Family Vocabulary Table
| Family Member | Your Family (humble) | Someone Else's Family (respectful) |
|---|---|---|
| Father | 父 (ちち, chichi) | お父さん (おとうさん, otōsan) |
| Mother | 母 (はは, haha) | お母さん (おかあさん, okāsan) |
| Older brother | 兄 (あに, ani) | お兄さん (おにいさん, onīsan) |
| Older sister | 姉 (あね, ane) | お姉さん (おねえさん, onēsan) |
| Younger brother | 弟 (おとうと, otōto) | 弟さん (おとうとさん, otōtosan) |
| Younger sister | 妹 (いもうと, imōto) | 妹さん (いもうとさん, imōtosan) |
| Husband | 主人/夫 (しゅじん/おっと) | ご主人/旦那さん (ごしゅじん/だんなさん) |
| Wife | 家内/妻 (かない/つま) | 奥さん (おくさん, okusan) |
| Children | 子供 (こども, kodomo) | お子さん (おこさん, okosan) |
| Grandfather | 祖父 (そふ, sofu) | おじいさん (ojīsan) |
| Grandmother | 祖母 (そぼ, sobo) | おばあさん (obāsan) |
| Uncle | 叔父/伯父 (おじ) | おじさん (ojisan) |
| Aunt | 叔母/伯母 (おば) | おばさん (obasan) |
The Key Rule
When talking about your own family to outsiders — use the humble column (left): 父、母、兄、姉、弟、妹、祖父、祖母.
When talking about or to someone else's family — use the respectful column (right): お父さん、お母さん、お兄さん、お姉さん、弟さん、妹さん、おじいさん、おばあさん.
When directly addressing your own family members — use the respectful forms as terms of address: you call your own father お父さん to his face, but you refer to him as 父 when speaking to others.
Introducing Your Family
Asking About Someone Else's Family
Family in Conversation Examples
Practice Japanese family vocabulary
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Check My Japanese free →Keigo reference guideFrequently Asked Questions
Why does Japanese have two sets of family words?
Japanese distinguishes between in-group (内, uchi) and out-group (外, soto). When speaking about your own family to outsiders, you use humble/plain terms to show modesty: 父 (father), 母 (mother), 兄 (older brother). When speaking about or to someone else's family, you use respectful terms with honorific お/ご prefixes: お父さん, お母さん, お兄さん. Using the respectful form for your own family sounds immodest.
How do you introduce your family in Japanese?
Use humble terms when talking about your own family. For example: 私の父は医者です (My father is a doctor) — use 父, not お父さん. When asking about someone else's family: お父さんはお元気ですか (Is your father well?) — use お父さん. The rule: humble for yours, respectful for theirs.
What is the difference between 主人/夫 and ご主人/旦那さん for "husband"?
主人 (shujin, "master of the house") and 夫 (otto, "husband") both refer to your own husband, with 夫 being more neutral and modern. ご主人 and 旦那さん refer to someone else's husband respectfully. Note: 主人 is considered old-fashioned by some as it implies the husband is the master — 夫 is increasingly preferred.
How do Japanese people address family members directly?
When directly addressing family members, Japanese speakers typically use the respectful titles as if the family member were an outsider: お父さん (to your own father), お兄さん (to your own older brother), おじいさん (to your own grandfather). The humble forms (父, 兄, 祖父) are only used when referring to your family to people outside the family.