おばあさんじゃなかったです
お祖母さんじゃなかったです
obāsanjanakattadesu

Noun
Desu Copula

The polite, past negative form of おばあさん

1. Wasn't my grandmother.; Wasn't a grandmother.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana