Satan and Adam had sex with Eve in the Garden of Eden Genesis 3:15 and 16

Www.shepherdschapel.com Pastor Arnold Murray teaches Genesis chapter 3 from the original Hebrew manuscripts documenting how one of the Mysteries of the Kingdom of Heaven of Matthew 13:11 is knowing that Satan has children on this Earth documented in Matthew 13:38 and 39.
The other mystery is Satan rebelled in the first Earth age and stole one third of God's children documented in 2nd Peter 3:5 through 10 and Jeremiah 4:18 through 25 that there was a first Earth age.
Then Satan tried to ruin the bloodline of Jesus Christ with getting even pregnant with Cain.
Cain is not in Adam's genealogy in Genesis chapter 5 Seth is the first son and he has his own genealogy in Genesis chapter 4.