"That student is a youngest child."
Translation:He pōkiʻi kēlā haumāna.
Hmmm, that's what I thought but I asked the same question in a different exercise and one of the regular answer people (I forget who?) said that it is always haumāna with the macron and Duolingo made a mistake. But I do see "hau.mana, hau.māna — Pukui-Elbert, Haw to Eng,
n. Student, pupil, apprentice, recruit, disciple (Mat. 10.1)." in wehewehe so I like your answer better ;).