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Hold firm boundaries
Do your in-laws like to arrive without calling, try to act like parents to their grandchildren, or invite themselves on trips that you and your spouse were treating as romantic dates? Talk to your partner about where to set boundaries, and agree to be firm in preventing in-laws from overstepping the mark. Most of the time, holding boundaries will involve clearly and calmly stating what is acceptable and why—a task that is less likely to cause explosive, long-term feuds if tackled by your spouse rather than you.