さんじゅうきょうだいじゃありません
三従兄弟じゃありません
sanjū kyōdaijārimasen

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
Terminal Form
Usually Written in Kana