حُرِّمَتْ عَلَيْكُمْ أُمَّهـتُكُمْ وَبَنَاتُكُمْ...
[ 506 ] **THE COMMENTARY PROHIBITION OF MARRIAGE WITH CLOSE RELATIVES (VERSE NO. 23) ** Here is a table of forbidden marriage with close relatives, and the table agrees mainly with what is usually accepted among all nations. The prohibition is due to: 1- blood relationship or consanguinity. 2- Fostrage or milk relations. 3- The relatives in - law.
Those related by blood, or the consanguineous are of seven groups: mother, daughter, sister, paternal aunt, maternal aunt, your brother's daughter, and your sister's daughter. Mother includes grand mother through the father or mother, great - grandmother and etc. Daughters too, includes grand daughter through son or daughter, great- grand- daughter and so on.
Then the fostrage and milk - relatives are named in the table; `Your foster- mother who have given suck to you, and also your foster- sister.' In the third stage there comes in the verse the relatives- in- law, who are mentioned in four groups: 1- `your wife's mothers.' This implies that as soon as you marry a girl, her mother and grand-mother, and going on, her great grand- mother will be unlawful for you in marriage for ever.