The Japanese word for grandmother is sobo and obāsan. Sobo is the informal word for grandmother while obāsan is more formal.
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| Romanji | Kanji | ||
|---|---|---|---|
| Grandmother そぼ | Sobo | 祖母 | |
| Grandmother おばあさん | Obāsan | お祖母さん | |
| Paternal grandmother ちちかたのそぼ | Chichikata no sobo | 父方の祖母 | |
| Maternal grandmother ははがたのそぼ | Hahagata no sobo | 母方の祖母 | |
| Great grandmother そうそぼ | Sōsobo | 曽祖母 | |
| Grandparents そふぼ | Sofubo | 祖父母 |
