Matthew Poole and continuators on Leviticus 18:17

17 Thou shalt not uncover the nakedness of a woman and her daughter , neither shalt thou take her sons daughter, or her daughters daughter, to uncover her nakedness: For they are her near kins-women: it is wickedness .

To wit, her step-daughter, and so her step-sons daughter, &c.

Because they are very near to thy wife by consanguinity, as coming directly from her, and therefore they are as near to thee by affinity, which binds as much as consanguinity, the wife, who is onely related by affinity▪ being nearer to a man than any other by consanguinity, they two being made one flesh, and therefore the same distance is to be observed in both of them.

Marginal references: chap. 20. 14.