Marrying

Forbidden to you in marriage are your mothers, daughters, sisters, paternal and maternal aunts, nieces, foster mothers, foster sisters, mothers-in-law, stepdaughters under your care, if you have consummated marriage with their mothers, wives of your sons, and marrying two sisters at once, except what has already passed.

4:23Forbidden unto you are your mothers, and your daughters, and your sisters, and your father's sisters, and your mother's sisters, and your brother's daughters and your sister's daughters, and your foster-mothers, and your foster-sisters, and your mothers-in-law, and your step-daughters who are under your protection (born) of your women unto whom ye have gone in - but if ye have not gone in unto them, then it is no sin for you (to marry their daughters) - and the wives of your sons who (spring) from your own loins. And (it is forbidden unto you) that ye should have two sisters together, except what hath already happened (of that nature) in the past. Lo! Allah is ever Forgiving, Merciful.