Were Adam and Eve's children incestuous?

Answer 1

yes, but their DNA was different, they were giant mammals with a complete genome.

children of eve were so diverse that they wouldnt even look similar to one another, just giant humanoid mammals.

according to the quran, adam had sets of children; male and female twins.
according to hadith, ijma and quiyas... prophet sheeth married his sister
according to the christian tradition, seth married his sister
according to the ancient greeks, zeus(seth) marries his sister, but commits adultery a gazillion times
according to the ancient egyptians, set marries his sister, but commits adultery a gazillion times