Translation guide
In Japanese, how you refer to your own grandmother versus someone else's, and the level of formality, depends on context. The most common, neutral term for one's own grandmother is 祖母 (sobo), while おばあさん (obaasan) is used for others' grandmothers or when addressing an elderly woman. In casual family speech, おばあちゃん (obaachan) is affectionate.
Use when speaking politely about your own grandmother to others, or in formal writing.
The standard, polite term for one's own grandmother. Used in formal contexts and when speaking to non-family members.
My grandmother lives in Kyoto.
Use within the family or when speaking casually about your own grandmother.
Affectionate, casual term for one's own grandmother. Commonly used by children and adults within the family.
Use when speaking politely about another person's grandmother.
Use when speaking directly to an elderly woman you don't know, or referring to her in a friendly way.
Use in literature, news, or formal descriptions.
Neutral, formal term used in writing.
祖母 is humble and used for your own grandmother when speaking to outsiders. おばあさん is honorific and used for others' grandmothers or to address an elderly woman. Using おばあさん for your own grandmother in formal contexts can sound childish or overly familiar.
My grandmother was a teacher. (polite, to a colleague)
I love Grandma's cooking the most.
Even more casual, sometimes used by older children or adults in very informal settings.
Hey Grandma, how are you?
Polite term for another person's grandmother. Also used to address an elderly woman in general.
How is your grandmother, Mr. Tanaka?
Very polite, honorific term for someone else's grandmother. Used in formal situations or to show extra respect.
Please give my regards to your grandmother.
Common, polite way to address or refer to an elderly woman. Can be used for strangers.
Ma'am, are you okay?
Affectionate, but can be overly familiar if used with strangers. Best used with elderly women you know well.
The old lady next door gave me some sweets.
彼の祖母は有名な画家だった。
His grandmother was a famous painter.
Literary term for an old woman, not specifically grandmother. Used in formal or literary contexts.
The old woman smiled quietly.
あなたのおばあさんは教師でしたか。
Was your grandmother a teacher? (polite, asking about someone else's)
In formal situations, using おばあさん to refer to your own grandmother is incorrect because it elevates your own family member, which is considered impolite. Stick to 祖母.