"Your mother did it again!"
The Fight: Sure, you've chosen a partner, but you don't get to choose the family they come from — or your own, for that matter. "There might be a mother who is unfriendly, a father-in-law who drinks too much, a sibling who's always asking for money," Schwartz tells POPSUGAR. "Those are the kinds of things where people argue because there's never an end to it and often they don't see it the same way as their partner."
The Fix: Create a game plan for how to treat individuals, like a meddling mother-in-law. "Those require protected conversations and coming to a joint policy that they agree to enforce," Schwartz advises. "It can help moderate the situation by, say, protecting one partner from the relative if they really can't deal with it. Or having a slush fund they use for the errant sibling so they don't go into their bank account. Yes, it's tough if you hate your wife's mother or your husband's best friend, but you can figure ways to isolate those things."