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  ====Season 3====
  Tywin harshly denies Tyrion his request to be named as heir to Casterly Rock, but does acquiesce to naming him Master of Coin. When he learns of Olenna Tyrell's plot to have Loras Tyrell wed Sansa Stark, he arranges to have Tyrion and Cersei marry Sansa and Loras respectively — though only succeeds with establishing Tyrion's marriage to Sansa. Later on, Tywin lectures Joffrey about how to rule as king when his grandson demands a report on his council meetings. Soon after Tyrion and Sansa's wedding, Tywin forms an alliance with Robb Starks' dissatisfied bannermen — Walder Frey and Roose Bolton — to successfully carry out the slaughtering of the Stark forces at "The Red Wedding"; in the ensuing massacre, Roose kills Robb while his mother Catelyn and wife Talisa are both killed as well. When news of Robb's death reaches the Lannisters, Tyrion quickly deduces that his father masterminded the event; Tywin confirms this and  shrewdly observes that this means the Freys will get all the credit, but also all the blame — since the Northerners will never forget nor forgive such a terrible crime. Tywin senses that his son finds the action dishonorable, but insists it was done to protect the family and end the war. He then reminds Tyrion of his duty to impregnate Sansa, explaining that a man who puts family first will always triumph. When Tyrion asks his father whether he has ever put the family's interests ahead of his own, Tywin retorts to have done so from the day Tyrion was born: he wanted to throw his newborn son into the sea, out of rage and grief at the death of his wife, but instead let Tyrion live and ended up raising him as his son — because he is a Lannister.