"He hiapo maikaʻi kona kaikuahine."

Translation: His sister is a good eldest child.

[Mr.Kainoa]

Odd English phrasing.

[deactivated user]

But I think it is exactly correct in Hawaiian.
"A good eldest child
His girl (is)."

[rabelon]

I had assumed that the first child would be the eldest child. I was marked incorrect.

[Lois985131]

why is "oldest" marked wrong?

[YishanWong]

Why isn't "Her sister is a good eldest child" also correct?

[Lois985131]

Kaikuahine means sister of a male

[YishanWong]

Thank you!!

[Endgator]

ah, that makes more sense, mahalo!