"Kaʻiulani is his grandmother."
Translation:ʻO Kaʻiulani kona tūtū wahine.
ʻtūtū wahineʻ, ʻkupunahineʻ, & ʻkupuna wahineʻ should all be accepted. Report it as a request that your answer should be accepted. Keep in mind, though, that ʻkupunahineʻ & ʻkupuna wahineʻ were not taught so far in Duolingo and that is why it is marking it wrong. The lessons are for people who do not have a prior knowledge of Hawaiian that we can draw upon for correct answers.
Just out of curiosity, why is the order of the sentence different when you say “Kaʻiulani is his grandmother” than if you were saying something like “Kaʻiulani is a farmer”?
As in, why is this sentence not “Kona tūtū wahine ʻo Kaʻiulani” or why is the other sentence not “ʻO Kaʻiulani he mahiʻai”?
[ETA: Apologies if I have an extra “ʻo” in there, I just did a bunch of lessons and they’re all blurring a bit.]
You need that ‘O at the beginning of this type of verbless sentence to show that the noun that follows is a definite noun. You cannot start a sentence with a noun and no noun particle (He or ‘O) before it.
The phrases in the polite expressions section such as Ke Akua pū or Iesū pū are exceptions because they are examples of hapahaole colloquialisms that are just shortened versions of grammatically correct complete sentences.
The ʻokina? The only way I know of to type one (other than copy and pasting) is to download a Hawaiian keyboard onto your device. Though there’s probably a way to add specifically the ʻokina to your setup, I’m just not tech-savvy enough.
Apologies if I misinterpreted your question.
The correct term for grandmother is kupuna wahine. Tutu wahine is a term of endearment for grandma To be sure you are using the correct word find the Hawaiian word in the dictionary and use the English translation that fits the situation.The developer found Tutu or Kuku under grandmother,but they didnʻt check the meaning of these two words which mean grandma or grandpa.
There are several Hawaiian language experts working on this, including employees of Kamehameha Schools and Ekela Kaniaupio-Crozier from the Kulaiwi Hawaiian lesson videos. I have strong confidence that they do not have to look in books to help develop this course. While tutu may seem colloquial as a term of endearment, it could easily be argued that it is an equivalent to ku'u vs. ko'u, both acceptable in regular use.