さんじゅうきょうだいなら【
三従兄弟なら
】

sanjū kyōdainara

Noun

,

Da Copula

The "-nara" conditional form ("if/when…") of みいとこ

1. If (it's) a third cousin; When (it's) a third cousin

Nara Conditional

,

Usually Written in Kana