Sarah laughs at God and Abraham talks back. But God’s taking it easy this week by destroying only two cities instead of the whole world. We see first-hand why Sodom and Gomorrah were in God’s crosshairs. Lot and his family escape to a cave where his daughters bring incest back in a big way. Abraham finally gets in on that trend with a huge reveal: His wife is also his half-sister!? At least they finally have the child they’ve been promised, who stirs up some perilous sibling rivalry and then is nearly stabbed to death by his father. (Genesis 18:1-22:24)