As Warden of the West, the lord paramount of the Westerlands, and patriarch of House Lannister, he is one of the wealthiest and most powerful men in Westeros. In his quest for power, he pushes his daughter, Cersei, into an abusive marriage with the philandering warlord King Robert Baratheon, which results in her bearing children with her brother. He also has a tumultuous relationship with his son Tyrion Lannister, whom he despises for surviving when his wife Joanna incurs complications at childbirth. This tense relationship culminates in Tywin blaming his son for his grandson's death and taking pleasure in doling out the death sentence. Luckily, Tyrion takes matters into his own hands and kills his father before the execution can take place.