I Was Doted on After Raising the Final Boss Duke’s Nephew - Chapter 24

This actually doesn’t makes sense , he’s a duke which is basically the second position after the emperor . How can people not know about the duchess ? Or how can they just fake it without any planning like that ? I mean participating together means that they will be considered as parents but their aren’t any details . They just decided , practiced and came here ? …… well anyway leon is cute as always .