さんじゅうきょうだいじゃないです
三従兄弟じゃないです
sanjū kyōdaijanaidesu

Noun
Desu Copula
Negation Auxiliary

The polite negative form of みいとこ

1. Not a third cousin.; Not related as a third cousin.

Negative
Polite
Casual Register
Usually Written in Kana