This really depends IC on the situation and the character. And just why any Treaty may fall short. You can follow the spirit of the Treaty if your characters desire it, you also can call anyone that doesn't dishonourable bastards. It also depends on how other Realms interpret the Treaty. And you get a situation where both sides think they are in the right for the other breaking the Treaty, good times
This is just very situation-sensitive depending on relations between both Realms, diplomatic stance on the Continent, character, and how and why the Treaty was written etc. etc. etc.
