I Can't Stand My Sister-in-Law. So I Helped My Brother Betray Her.
Briefly

In a dilemma about family loyalty and values, a woman targets her brother's infidelity. He requests access to her vacation cabin to continue his affair, unaware of the impact on her husband. Choosing not to disclose this arrangement to her spouse, tension arises when he plans a month-long family stay at the cabin. The advice counters supporting an extramarital relationship and emphasizes that those having affairs should handle their arrangements. Ultimately, moral obligations and the complexities of family dynamics are explored in this situation.
I am of the opinion that the person(s) having an affair are responsible for logistics. You don't owe your brother a month of accommodations.
If your brother is capable of having an affair, he should be capable of securing a location for it.
Read at Slate Magazine
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