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Japanese family words

Family vocabulary in Japanese has one surprise that trips up every beginner: each relative has two different words. There's a humble word you use for your own family — 母 (haha) for "my mother" — and a polite, honorific word you use for someone else's family, and to address your own elders — お母さん (okāsan). Pick the wrong one and the sentence sounds either rude or oddly formal. Here's the whole system: the in-group/out-group rule that drives it, a full table of relatives, and the long-vowel trap that turns an uncle into a grandfather.

The one rule: my family vs your family

Japanese constantly sorts people into うち (uchi, "in-group" — my household, my company) and そと (soto, "out-group" — everyone else). Family words follow that split exactly:

So the choice isn't really about who the person is — it's about whose family they belong to and who you're speaking to. Talking about your mother to a friend, you lower your own side: 母は先生です。 (haha wa sensei desu — "my mother is a teacher"). Asking about your friend's mother, you raise theirs: お母さんは元気ですか。 (okāsan wa genki desu ka — "is your mother well?").

The full family table

The left column is the humble word for talking about your own family; the right column is the honorific word for someone else's family (and for addressing your own seniors). Most honorific forms are just the plain word wrapped in お〜さん or given the polite prefix ご.

Notice the pattern in the right column: parents and grandparents and older siblings get the full お〜さん treatment, younger relatives just take a polite 〜さん on the plain word, and the bigger group nouns take ご. You're not memorising 36 separate words — you're memorising 18 plain words plus one wrapping rule.

Addressing your own family

Here's the twist that makes the rule click. You call your own seniors by the honorific word, because you don't lower people who are above you inside the household. Children call their parents お母さん / お父さん, and a younger sibling calls an older one お兄さん / お姉さん (often shortened warmly to 兄ちゃん / 姉ちゃん). The humble 母 / 父 are for describing them to outsiders, never for calling out to them across the room.

Going the other way, you address juniors by name, not by relationship: you call your little brother けんた, not 弟. So the humble words for younger siblings (弟, 妹) only ever come up when you mention them to someone else.

The おじさん / おじいさん trap

This is the family word everyone gets wrong at least once, and it's pure vowel length. The difference between "uncle" and "grandfather" is a single extra beat held on the vowel:

In Japanese a long vowel is a separate beat, not just a stressed sound — おじいさん is held one mora longer than おじさん. Call your friend's grandfather an "uncle" (or worse, call a middle-aged stranger "grandpa") and you'll get a look. When you write it in kana the difference is right there: the extra い / あ. It's the same length-changes-the-word principle covered on the pronunciation page.

Counting your family

To say how many people are in your family, use the people-counter 人 (nin) in front of 家族 — with the two irregular readings 一人 (hitori) and 二人 (futari) you met on the counters page:

• 四人家族です。 — We're a family of four. (yonin kazoku)
• 兄弟が二人います。 — I have two siblings. (kyōdai ga futari imasu)
• 姉が一人います。 — I have one older sister. (ane ga hitori imasu)

People and animals "exist" with the verb います (imasu), not あります — so "I have a brother" comes out literally as "an older brother exists": 兄がいます。

Talking about your family

Put it together with the topic particle は and a describing word, and you can introduce your whole family. Notice every word stays in the humble column, because you're speaking to an outsider:

• 父は会社員です。 — My father is an office worker. (chichi)
• 母は料理が上手です。 — My mother is good at cooking. (haha)
• 妹は学生です。 — My younger sister is a student. (imōto)

Putting it together

1. Every relative has two words. Humble for your own family, honorific for other people's.
2. Talking about your family to an outsider → use the plain humble word: 母, 父, 兄.
3. Asking about / addressing others → use the お〜さん / ご〜 honorific word.
4. Call your own seniors by the honorific word, but address juniors by name.
5. Mind the long vowel: おじさん (uncle) ≠ おじいさん (grandpa).

Common questions

Why does every family member have two words?

Japanese sorts people into your in-group (うち uchi) and everyone else (そと soto). About your own family you use a humble plain word (母 haha); about or to someone else's you use an honorific word (お母さん okāsan). One relative, two words, chosen by whose family it is.

Do I call my own mother haha or okāsan?

Both, depending on who you're talking to. You call her お母さん to her face and inside the family. But when you mention her to an outsider you switch to the humble 母: 母は元気です ("my mother is well"). Same split for 父／お父さん and 兄／お兄さん.

What's the difference between ojisan and ojīsan?

The long vowel. おじさん (ojisan, short) is uncle or a middle-aged man; おじいさん (ojīsan, held "ii") is grandfather or an old man. The same one-beat difference separates おばさん (aunt) from おばあさん (grandmother).

How do you say "I have a brother / sister"?

Use います (exist, for people): 兄がいます ("I have an older brother"), 妹がいます ("I have a younger sister"). To count them add the people-counter: 兄弟が二人います ("I have two siblings," with futari).

How do you say "family" in Japanese?

Your own family is 家族 (kazoku); someone else's takes the polite ご: ご家族 (gokazoku). "A family of four" is 四人家族 (yonin kazoku).

Next steps: lock the long vowels with pronunciation, count your relatives with counters, or wire family words into sentences with particles.