Translation of "Tribal" in Japanese

Imagine, for the sake of argument, a tribal group in which mother-son incest was countenanced.

議論のため、母親と息子の近親相姦が黙認されている部族社会を仮定してみよう。

We're on the lookout for a tribal elder who's supposed to meet me to collect the vaccines.

部族(ぶぞく)の長老をさがす ワクチンをわたすことに なってる