Thou shalt not uncover the nakedness of thy brother's wife: it is thy brother's nakedness. Thy brother's wife - This was an illegal marriage, unless the brother died childless. In that case it was not only lawful for her to marry her brother-in-law, but he was obliged by the law, Deuteronomy 25:5, to take her to wife.
Related Commentaries of Leviticus 18:16
Leviticus 18:16
16 Thou shalt not uncover the nakedness of thy brother's wife: it is thy brother's nakedness.