Sister: as the following words suggest, this can include both full- and half-sisters. No matter that the woman is only the man’s half-sister (Good News Translation, Contemporary English Version), either by his father or by his mother, such behavior is prohibited. See Lev 18.9; 20.17.

Quoted with permission from Bratcher, Robert G. and Hatton, Howard A. A Handbook on Deuteronomy. (UBS Helps for Translators). New York: UBS, 2000. For this and other handbooks for translators see here .