King of Gehenna at MgRonalds

Rin was taken by Mephisto and Yukio to Hatagaya to watch over his progress as an exorcist. They suddenly got their stomachs empty and they headed over to eat at MgRonalds, in which Mephisto Pheles got a reunion with his father whom he barely noticed. What would Rin's reaction be at his father's "generals"? Please give it a try