1.
grandmother (humble/formal)
The humble or formal term for one's own grandmother. Used when speaking about your grandmother to others in polite contexts.
My grandmother lives far away, so I often go to see her during summer vacation.
祖母 is the humble/formal term for one's own grandmother, used when speaking to others in polite or formal contexts.
FAMILY TERM REGISTER:
- 祖母: humble/formal (about your own grandmother)
- おばあさん: neutral-polite (about someone else's grandmother)
- おばあちゃん: casual/affectionate (direct address or about your own)
- おばあさま: respectful (about someone else's grandmother)
COMPANION TERMS:
- 祖父: grandfather (same humble/formal register)
- 祖父母: grandparents
USAGE:
In writing, essays, and formal speech, 祖母 is standard. In everyday conversation, most people say おばあちゃん when talking about their own grandmother.
NOTE:
外祖母 specifically means maternal grandmother, and 内祖母 means paternal grandmother, but these terms are rarely used in daily conversation.