おじちゃんじゃなかったです
叔父ちゃんじゃなかったです
ojichanjanakattadesu

Noun
Desu Copula

The polite, past negative form of おじちゃん

1. Wasn't my uncle.; Wasn't my (paternal) uncle.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana