How did Adam and Eves family multiply?

Based on knowing that these were the first people on Earth, the only way to reproduce was incest between the sons and daughters of Adam and Eve.

How did Adam and Eve have grand children?

They had grandchildren when their children began marrying their siblings and procreating. Everyone married relatives in the ancient world, because everyone was relatives. Adam and Eve are the ancestors of EVERYONE.

Did Adam and Eve have twin daughters?

Aclima (also Kalmana, Lusia, Cainan, or Luluwa) according to some religious traditions was the oldest daughter of Adam and Eve, the twin sister of Cain….

Aclima
Other names	Kalmana, Calmana, Cainan, Luluwa
Known for	First female born Being the cause of the world’s first murder

How many sons and daughters did Adam and Eve have?

Adam and Eve had many sons and daughters. Genesis chapter 4 tells us that Cain and Abel were the two oldest sons, and then other sons were born.

Did Adam and Eve have children between Abel and Seth?

At first glance, Genesis 4-5 sounds like it’s saying Adam and Eve didn’t have any children between Abel and Seth. It says that “After the birth of Seth, Adam lived another 800 years and he had other sons and daughters,” (5:4) as if there was a long period where it was just Adam, Eve, and their two sons followed by a big expansion after Seth.

Why did Adam and Eve have children with no genetic defects?

Why this shift occurred is hard to say. Since Genesis describes all that was created in the Garden of Eden as good, including Adam and Eve, their genes may have been well-developed to the point that their kids could marry siblings and produce children with no genetic defects.

Did God create any humans other than Adam and Eve?

There is no indication anywhere in the Bible that God created any humans other than Adam and Eve. In Genesis 2 we read, “This is the account of the heavens and the earth when they were created, in the day that the LORD God made earth and heaven.