Abraham dies and leaves nothing to his children by his concubines, only Isaac gets anything. They’re just slaves anyway. There is more about who is having which children, which I assume is meant to show the provenance of all the tribes.
Isaac has his twins, Esau and then Jacob. The latter is always jealous of the former, and at a low moment, convinces him to give up his birthright for a bowl of lentil stew. Not a great bargain, but Esau doesn’t seem to be a bright kid. He does grow up to have two wife’s, so he’s not doing so bad.
In the next chapter, Isaac moves to Gerar, and decides to play his father’s wife/sister trick. This time, Abimelach (again!) catches him, curses him, and then rewards him for his trickiness. Remember, if you are trying to pretend your wife is your sister, no PDAs.
Most of these last chapters don’t make much sense, except that God is rewarding Isaac and his family by being loyal and fearful. So everybody, remember to obey!
Tomorrow: Genesis 27-29.