en_tn/lev/20/21.md

marries his brother’s wife

Some interpret this to apply only when the brother is still alive or has become the father of male children by the woman.

He has uncovered his brother's nakedness

Here the idiom "uncovered ... nakedness" means "disgraced." See how you translated this idiom in Leviticus 18:7. Alternate translation: "He has disgraced his brother" or "He has shamed his brother" (See: rc://en/ta/man/jit/figs-idiom)