Sister (full, paternal and maternal) in law

Sister (ukht). A sister is one born to the same father and mother or to one of them; the word may also be used for a milk-sister by verbal or circumstantial indication, the legal use not departing from the lexical. A milk-sister is one whose mother suckled you, or whose mother you suckled, or whom a single woman suckled with you, or whom a single man's wife suckled with you. ¹ A full sister is called the sister of the same blood; a sister by father is the sister by father; a sister by mother is the sister by mother. ¹ General ruling. The sister is one of the within-prohibition kin (dhu al-rahim al-mahram): she has the ruling of such kin in the duty of keeping ties, in the permission to look and what is like it, in the prohibition of marriage, in combining kin in marriage or possession, in maintenance, in the increased blood-money, and in the right to freedom if her brother or sister owns her. Some rulings apply to her and not to other kin: zakat may be given to a sister by agreement, though some jurists require that she not inherit in fact; while zakat may not be given to some prohibited kin, such as a daughter. ¹ In inheritance, the sister is blocked by what blocks the brother: she is blocked by the father and a male inheriting descendant; the maternal sister is blocked by the grandfather. ¹ A full or paternal sister inherits by a fixed share or by agnation; the maternal sister inherits only by a fixed share. A sister is not an agnate in her own right but through another or with another, and she does not block one weaker than herself if she has a fixed share. ¹ In custody the sister precedes the brother, and comes after the mother by agreement and after the father in schools other than the Hanafis. ¹ The maternal sister is like the other kinswomen in rulings except inheritance: she inherits only by a fixed share and not by agnation; with her male brother from the mother she shares equally and takes the same as him; she is blocked by any inheriting descendant and by a male inheriting ascendant such as the father or grandfather. ¹ Milk-sister: see sister. ¹