Which episode is the fist bump between Minato and his sons?

It's in episode 600.

In the "Naruto" manga, Minato and his son fist bumped in episode 600. In this episode, in order to defeat the powerful Six Paths Obito, the fourth generation Hokage Namikaze Minato and Naruto chose to cooperate. The father and son fist bumped and shared the Nine-Tails chakra, forming a powerful super-large Jade Rasengan, successfully repelling the Six Paths Obito. It can be said that father and son are very powerful when they work together, and they trust each other.