You can finish both initial quests for both families (Big fish and Bad feelings in Polish) and then make peace between them, even though the matron of B. told me that there is no place for peace after finishing her quest (I told her that they wanted to rob her). She simply had an old dialogue question thal allowed me later to inform her that A-guy wants to meet with her and talk about peace. This does make little sense. Also, when you go with the Family Pride without doing Big fish and Sinking Feeling, the two latter quests become failed, what (I think) proves my point. But I'm glad I was able to do them both and get the xp from them both