"ʻO Lani kona makuahine hūnōai."
Translation:Lani is her mother-in-law.
[PE] 1 Father- or mother-in-law, usually after makua and followed by kāne or wahine for specific designation of sex. These terms apply also to uncle and aunt by marriage. [PCP fungawai]
[LA] 1 n A parent-in-law, either father or mother, according to the designating terms kane or wahine. See HONOAI.
The hint for "hunoai" (pardon the missing diacritics) isn't showing. I assume it is supposed to be "in-law."
Mahalo for bringing this up. I've also noticed that a number of hints are not appearing. We have them in the system on our end, but there is either a bug with the display, or the Duolingo system just hasn't updated to show them yet. I'll contact Duolingo staff about it.