Family vocabulary in Japanese is not a simple list of labels. It reflects one of the central organizing principles of Japanese social language: the distinction between 内 (uchi, inside / one's own group) and 外 (soto, outside / another group). For every family relationship, Japanese maintains two parallel sets of words.
One set is humble and refers to one's own family members; the other is respectful and refers to someone else's family members or is used to address one's own family members directly. Mixing up the sets is not merely ungrammatical; it sends a message about the speaker's understanding of social hierarchy and in-group membership.
A second feature of Japanese family vocabulary is age-based differentiation for siblings. Japanese has distinct words for older brother, younger brother, older sister, and younger sister, and these cannot be collapsed into a unisex term. The choice is obligatory even in casual conversation. This reflects the historically important role of birth order in East Asian family structure and continues to shape daily speech.
A third feature is the extension of family terms to non-relatives. A neighborhood grandmother may be called おばあさん by children with no biological tie, and a woman in her thirties can be politely hailed as お姉さん by a vendor. The family terms double as approximate age and gender markers in public discourse. This article lays out the core vocabulary with both in-group and out-group forms, explains when to use which, and notes common extensions and mistakes.
The Uchi and Soto Split
The basic rule is simple:
- When you refer to a member of your own family in conversation with someone outside the family, use the humble, plain form (often without an honorific).
- When you refer to someone else's family member, use the respectful form (usually with the お or ご prefix and the さん suffix).
- When you address your own family member directly, use the respectful form.
Example:
- To a coworker: 父は医者です (chichi wa isha desu) - my father is a doctor (humble, my family)
- Asking a coworker: お父さんはお元気ですか (otousan wa ogenki desu ka) - is your father well (respectful, their family)
- Calling across the room at home: お父さん、ご飯だよ (otousan, gohan da yo) - dad, dinner is ready (respectful address)
Learning note: This split is not optional politeness. Saying お父さんは医者です about your own father to an outsider sounds arrogant, as if you are exalting your own family. Saying 父はお元気ですか about someone else's father sounds dismissive.
Core Family Vocabulary
| Relationship | In-Group (my) | Out-Group (your/their) |
|---|---|---|
| family | 家族 (kazoku) | ご家族 (gokazoku) |
| father | 父 (chichi) | お父さん (otousan) |
| mother | 母 (haha) | お母さん (okaasan) |
| older brother | 兄 (ani) | お兄さん (oniisan) |
| older sister | 姉 (ane) | お姉さん (oneesan) |
| younger brother | 弟 (otouto) | 弟さん (otoutosan) |
| younger sister | 妹 (imouto) | 妹さん (imoutosan) |
| siblings | 兄弟 (kyoudai) | ご兄弟 (gokyoudai) |
| grandfather | 祖父 (sofu) | おじいさん (ojiisan) |
| grandmother | 祖母 (sobo) | おばあさん (obaasan) |
| uncle | おじ (oji) | おじさん (ojisan) |
| aunt | おば (oba) | おばさん (obasan) |
| cousin | いとこ (itoko) | いとこさん (itokosan) |
| nephew | 甥 (oi) | 甥御さん (oigosan) |
| niece | 姪 (mei) | 姪御さん (meigosan) |
| child | 子供 (kodomo) | お子さん (okosan) |
| son | 息子 (musuko) | 息子さん (musukosan) |
| daughter | 娘 (musume) | お嬢さん (ojousan) |
| husband | 夫 (otto) / 主人 (shujin) | ご主人 (goshujin) / 旦那さん (dannasan) |
| wife | 妻 (tsuma) / 家内 (kanai) | 奥さん (okusan) |
Younger siblings do not have a distinct out-group form at the root; the さん suffix is added instead. This asymmetry reflects the social convention that older family members receive more elaborate honorific marking.
Age-Based Sibling Terms
Unlike English, Japanese forces a choice between older and younger sibling in almost every utterance.
| Japanese | Romaji | English |
|---|---|---|
| 兄 | ani | older brother (my) |
| お兄さん | oniisan | older brother (your/someone's) |
| 弟 | otouto | younger brother |
| 姉 | ane | older sister (my) |
| お姉さん | oneesan | older sister (your/someone's) |
| 妹 | imouto | younger sister |
| 兄弟 | kyoudai | siblings / brothers (generic) |
| 姉妹 | shimai | sisters (generic) |
| 長男 | chounan | eldest son |
| 長女 | choujo | eldest daughter |
| 次男 | jinan | second son |
| 次女 | jijo | second daughter |
| 末っ子 | suekko | youngest child |
| 一人っ子 | hitorikko | only child |
The compound 兄弟 (kyoudai) literally combines "older brother" and "younger brother" and is used for siblings in general regardless of actual gender. It is the word that appears in sentences such as ご兄弟はいますか (gokyoudai wa imasu ka) - do you have siblings.
Cultural note: Birth order has historical weight in Japanese family structure. The eldest son (長男) traditionally inherited the family name and often the family business, and even today family photographs, seating arrangements at weddings, and memorial rites encode birth order.
Respectful Prefixes
Two prefixes dominate family vocabulary:
- お- is used with native Japanese words: お父さん, お母さん, お姉さん, お兄さん, お子さん.
- ご- is used with Sino-Japanese words: ご家族, ご兄弟, ご主人, ご両親.
The suffix -さん is added for respect. Variants such as -さま (formal) and -ちゃん (affectionate, diminutive) also appear.
- お父様 (otousama) - very formal "father"
- お父ちゃん (otouchan) - affectionate "daddy"
- お母ちゃん (okaachan) - affectionate "mommy"
- お兄ちゃん (oniichan) - affectionate "big brother"
- お姉ちゃん (oneechan) - affectionate "big sister"
Children are especially likely to use the -chan forms, and they persist into adulthood in close families.
Parents and Grandparents
| Japanese | Romaji | English |
|---|---|---|
| 両親 | ryoushin | parents (my) |
| ご両親 | goryoushin | parents (your/someone's) |
| 父親 | chichioya | father (written/formal) |
| 母親 | hahaoya | mother (written/formal) |
| 祖父母 | sofubo | grandparents |
| 祖父 | sofu | grandfather (written) |
| 祖母 | sobo | grandmother (written) |
| おじいちゃん | ojiichan | grandpa (affectionate) |
| おばあちゃん | obaachan | grandma (affectionate) |
| 曾祖父 | sousofu | great-grandfather |
| 曾祖母 | sousobo | great-grandmother |
The written forms 父親 and 母親 appear on forms, in news stories, and in scholarly writing. In spoken Japanese, 父 and 母 (or their respectful counterparts) are standard.
Spouses and Relatives by Marriage
Vocabulary for spouses varies with formality and with which spouse is speaking.
| Japanese | Romaji | English | Notes |
|---|---|---|---|
| 夫 | otto | husband (my) | Neutral |
| 主人 | shujin | husband (my) | Slightly old-fashioned, means 'master' |
| 旦那 | danna | husband (my, casual) | Casual, less formal |
| 妻 | tsuma | wife (my) | Neutral |
| 家内 | kanai | wife (my) | Literally 'inside the house', old-fashioned |
| 嫁 | yome | daughter-in-law / bride / wife | Context-dependent |
| ご主人 | goshujin | your husband | Respectful |
| 奥さん | okusan | your wife | Respectful, literally 'the inner one' |
| 婚約者 | kon'yakusha | fiance / fiancee | |
| 義父 | gifu | father-in-law | |
| 義母 | gibo | mother-in-law | |
| 義兄 | gikei | brother-in-law | |
| 義姉 | gishi | sister-in-law |
The words 主人 and 家内 are gendered in ways that feel outdated to younger speakers. Many women today refer to their husbands as 夫 or 旦那 and describe their wives as 妻 or パートナー (paatonaa, partner).
Extended Family
| Japanese | Romaji | English |
|---|---|---|
| 親戚 | shinseki | relatives |
| 叔父 / 伯父 | oji | uncle (younger / older than parent) |
| 叔母 / 伯母 | oba | aunt (younger / older than parent) |
| 従兄弟 | itoko | cousin (male) |
| 従姉妹 | itoko | cousin (female) |
| 義理の | giri no | in-law (prefix) |
| 血縁 | ketsuen | blood relation |
| 家系 | kakei | family line |
| 先祖 | senzo | ancestors |
| 子孫 | shison | descendants |
Japanese distinguishes, in writing, between uncles and aunts older than one's parent (伯父, 伯母) and those younger (叔父, 叔母). In speech, both are pronounced おじ and おば, so the distinction appears only on paper.
Children, Age Categories, and Generations
| Japanese | Romaji | English |
|---|---|---|
| 赤ちゃん | akachan | baby |
| 子供 | kodomo | child |
| 男の子 | otoko no ko | boy |
| 女の子 | onna no ko | girl |
| 男性 | dansei | man (adult) |
| 女性 | josei | woman (adult) |
| 若者 | wakamono | young person |
| 大人 | otona | adult |
| 年配 | nenpai | elderly |
| 世代 | sedai | generation |
| 父母 | fubo | father and mother (formal) |
| 孫 | mago | grandchild |
Family Terms for Non-Relatives
Japanese extends family terms to strangers based on apparent age and gender.
| Japanese | Romaji | Typical Use |
|---|---|---|
| お兄さん | oniisan | a young man, often hailing a server or vendor |
| お姉さん | oneesan | a young woman, in similar contexts |
| おじさん | ojisan | a middle-aged man |
| おばさん | obasan | a middle-aged woman |
| おじいさん | ojiisan | an elderly man |
| おばあさん | obaasan | an elderly woman |
Cultural note: Calling someone おばさん who does not yet consider herself middle-aged can be mildly offensive. Japanese speakers are often careful with the boundary between お姉さん and おばさん, and advertising targets this anxiety directly.
Example Conversations
A student introducing family:
私の家族は四人です。父と母と姉と私です。父は会社員で、母は看護師です。姉は大学生です。
(watashi no kazoku wa yonin desu. chichi to haha to ane to watashi desu. chichi wa kaishain de, haha wa kangoshi desu. ane wa daigakusei desu.)
"My family is four people. Father, mother, older sister, and me. My father is a company employee, my mother is a nurse. My older sister is a university student."
A coworker asking:
ご兄弟はいらっしゃいますか。お父様のお仕事は何ですか。
(gokyoudai wa irasshaimasu ka. otousama no oshigoto wa nan desu ka.)
"Do you have siblings? What is your father's work?"
Common Mistakes
- Using お父さん when talking about your own father to outsiders. The correct form is 父. Using the respectful form about your own family sounds arrogant.
- Using 父 when speaking to your father face to face. Direct address uses the respectful お父さん or the affectionate お父ちゃん.
- Collapsing 兄 and 弟 into "brother". Japanese requires the age marker and cannot use one word for both.
- Confusing おじさん and おじいさん. The long vowel changes uncle to grandfather; careful pronunciation is necessary.
- Using 家内 thoughtlessly. Younger speakers and many women consider this word dated because of its literal meaning "inside the house".
Quick Reference
- My family: 私の家族 (watashi no kazoku)
- Your family (polite): ご家族 (gokazoku)
- My father: 父 (chichi) / your father: お父さん (otousan)
- My mother: 母 (haha) / your mother: お母さん (okaasan)
- My older brother: 兄 (ani) / yours: お兄さん (oniisan)
- My younger sister: 妹 (imouto) / yours: 妹さん (imoutosan)
- Parents: 両親 (ryoushin) / theirs: ご両親 (goryoushin)
- Grandparents: 祖父母 (sofubo)
- How many in your family: ご家族は何人ですか (gokazoku wa nannin desu ka)
- Do you have siblings: ご兄弟はいますか (gokyoudai wa imasu ka)
See Also
Frequently asked questions
Why does Japanese have two words for each family member?
Japanese distinguishes between talking about members of your own group (uchi) and members of others’ groups (soto). For your own family, plain words like 父 (chichi) and 母 (haha) are used. When referring to someone else’s family or addressing your own in direct speech, the polite forms お父さん (otousan) and お母さん (okaasan) are used.
Do I say お父さん when talking to my own father?
Yes. The polite form お父さん is used when addressing your father directly or when a young child is the speaker. In adult writing or formal speech about your own family, 父 is correct. This split between humble reference and respectful address is characteristic of Japanese family vocabulary.
How do I refer to older and younger siblings differently?
Japanese has separate words for older and younger siblings: 兄 (ani) / お兄さん (oniisan) for older brother, 弟 (otouto) for younger brother; 姉 (ane) / お姉さん (oneesan) for older sister, 妹 (imouto) for younger sister. Age order is grammatically encoded and cannot be flattened into a single word.
What does おじさん versus おじいさん mean?
おじさん (ojisan) means uncle or, more loosely, a middle-aged man. おじいさん (ojiisan) means grandfather or, loosely, an elderly man. The long vowel in the second form is crucial and distinguishes the meanings. Similar contrast exists for おばさん (aunt) versus おばあさん (grandmother).
Are family terms used for non-relatives?
Yes. Japanese children and adults sometimes call unrelated adults おじさん, おばさん, おじいさん, or おばあさん based on apparent age. Calling a shopkeeper お兄さん or お姉さん is a friendly way to address them. Unlike in English, these terms do not always imply biological relationship.
What is the polite way to ask about someone's family?
Use the out-group forms: ご家族は何人ですか (gokazoku wa nannin desu ka) for ‘how many in your family’, ご兄弟はいますか (gokyoudai wa imasu ka) for ‘do you have siblings’. The prefixes ご and お mark the referent as belonging to another’s family.
What is the word for 'family' and what does it include?
家族 (kazoku) is the general word for ‘family’ and covers the immediate household. 親戚 (shinseki) means ‘relatives’ more broadly, including extended family. 一族 (ichizoku) means ‘clan’ or ‘extended family line’ and has a more formal, sometimes historical tone.
