That's precisely why the brother must go, the wife figures she has an inside track to leverage the trip details, and Ole Otter will feel the everpresent long arm of fidelity during the trip. Therefore, I offer for consideration, the Dogmatic Prevaricator Travel Companion Service, I'm cheap and I'll lie, cheat or steal to ensure your travel escapades are kept confidential. Hell, I even do the trip report. All this for a modest professional fee of $50 down and $50 a week for 50 years.
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If you must choose between two evils, pick the one you've never tried before.