Feeling a bit defeated, I hatched a plan to ask MIL for the key during our family dinner later that week. 'You think she'll give it up?' Sarah asked, a hint of doubt in her voice. I nodded, hoping for the best. 'Maybe it’s just old documents,' I replied, trying to ease both our minds. The thought of unlocking the mystery tugged at me, but I planned to approach it casually at dinner.