If Adam & Eve were the first two humans, are we all the product of incest?

Question

Where did Cain and Able get their wives? Or did they just cohabitate with the livestock? Had to have been their sisters, right?

Answer 1

If you believe the story literally, then it isn't much of a leap to assume God created a couple of wives.

If you don't believe it literally, you could point to Cain's concern that others would kill him (Genesis 4:12-15) and assume there were other people on the earth.

And if you believe it is just a story, then don't worry about it.

Answer 2

Adam was created first, then Eve was created from the rib of Adam.

After they were placed on earth, they procreated.
Their offspring were born in pigeon pairs i.e. they had twins who were one male child and one female child.

The female offspring from the first set of twins married the male offspring from the second set of twins.
The male from the first set of twins married the female from the second set of twins.

That was how their family grew.