dual vs. plural (Acts 7:16)

In this episode in Acts it is ambiguous whether only Jacob and Joseph or Jacob and all of the other patriarchs were were taken back to Shechem. In languages that distinguish between a dual and a plural this ambiguity has to be resolved. In the translation into Kahua only two bodies were taken back because Joseph’s body is specifically mentioned in Exod 13:19 and Josh 24:32.