To whom Adam and Eve children were married according the Quran?

Answer 1

According to Koran, Adam and Eve always had children in tween pairs. That is they were born as tween brothers and sisters. To be more clear, it was always a tween, and each pair was always a son and a daughter, and never two sons or two daughters.

Now, for marriage among children, which by today's tradition were all brothers and sisters, is obviously 'questionable'. Koran, however suggests that God also had rules for it.

The rule was simple, a boy can't marry his tween sister, with whom he shared his mother's womb. So technically, the decency factor was present.

It is also believed, the first murder in human history was also done for the same issue, when Cain, Adam's son wanted to marry his tween, while it was unlawful, and that Abel, Adam's another son was chosen - Cain got jealous and killed Abel.