In the Patron/Vassal relationship, if one side were to be overly insincere, something like cancelling it would be possible too.
After examination the side of the lower nobles management organisation would immediately change the patron once they discovered a compatible relationship. It was normal for the central government to not say anything at all to such procedure.
“Baron Baumeister is pretty stubborn for his age. There is also Erich-san at the royal capital.” (Retainer)