Surah An-Nisa Verse 23

531 This Table of Prohibited Degrees agrees in the main with what is usually accepted among all nations, except in minor details. It begins in the last verse (with father's widows or divorcees). The scheme is drawn upon the assumption that the person who proposes to marry is a man; if it is a woman, the same scheme will apply, mutatis mutandis; it will read: "your fathers, sons, brothers," etc.; or you can always read it from the husband's view of relationship, as there must always be a husband in a marriage. 532 "Mother" includes grandmother (through the father or mother), great - grandmother, etc.; "daughter" includes granddaughter through son or daughter), great-granddaughter, etc.; "sister," includes full-sister and half-sister. "Father's sister" includes grandfather's sister, etc. and "mother's sister" includes grandmother's sister, etc. 533 "Fosterage" or milk-relationships play an important part in Muslim Law, and count like blood-relationships; it would therefore seem that not only fostermothers and foster-sisters, but foster-mother's sister, etc., all come within the prohibited degrees. 534 It is generally held that "under your guardianship" is a description, not a condition. (R). 535 "Sons" includes grandsons, but excludes adopted sons, or persons treated as such, on account of the words "proceeding from your loins" (Cf. 33:4). 536 The bar against two sisters in marriage together applies to aunt and niece together, but not to deceased wife's sister after the wife dies.