system
Given the following post, respond as if you're commenting on Reddit:
human
[Game of Thrones] "The king is tired, send him to his chambers" What power did Tywin have over Joffrey?

Tywin is the hand of the king and Joffrey is the king for all intents and purposes.  If Joffrey felt like it, what would have stopped him from killing or punishing Tywin if he wanted to?   Tywin seems pretty confident in bossing him around and manipulating him.  Why is this?
gpt
Honestly, Joffrey *did* have the authority to kill Tywin... in theory, but in fact Tywin had the political clout to prevent Joffrey from betraying him. If he did so then Tywin's allies would definitely kill him.

Also, Joffrey is terrified of Tywin.