Zake and walimu indicates the plural. For singular it would have been yake and mwalimu
I think a little hint was also "walimu" instead of singular "mwalimu".
I thought brother = ndugu. Is ndugu same as kaka?
Why is it "brothers" rather than "brother"? What makes it plural?
It's the zake instead of yake.
So is kaka one of the 'people' nouns that doesn't go in the m/wa class? Is 'kaka wake' not correct?
All close family members are N class. Kaka wake is not correct. Adjectives agree as if they were M/WA, but possessives use y/z to show plurality.