From Nā Kai ʻEwalu, Beginning Hawaiian Lessons

grandfather = kupuna kāne

grandpa = tūtū kāne

grandpa = kūkū kāne

grandpa = tūtū

grandpa = kūkū

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grandmother = kupuna wahine

grandma = tūtū wahine

grandma = kūkū wahine

grandma = tūtū

grandma = kūkū