How do you render ‘ka’ as in ‘kapuso’ in English?

You will use ‘sort’

Merriam-Webster Dictionary’s one usage of ‘sort’: agree, harmonize (his benign view sorts badly with reality — Henry Trewhitt)

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kapuso

Sila ang mga kapuso ko.

They are those who sort with me by blood.

(more examples in the succeeding blogs)

(We will give you a series of examples in the succeeding blogs.)