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Cersei comes clean about knocking boots with Jaime.
On the show: Cersei, in a moment of reckless honesty or calculated politics, forces her father to see the truth. She’s been sleeping with her twin for most of her adult life and Tywin’s three beloved grandchildren are the product of incest, which totally explains everything about Joffrey to be honest.
Wait, what? This never happens. Book Cersei would never endanger her children and their claim to the throne by admitting their parentage to anyone, much less her own father. Tywin Lannister isn’t above infanticide as the Targaryens found out the hard way. The Lannister patriarch went to his death blissfully unaware of the unholy dalliance happening right under his nose for literal decades.