We’ve all heard stories of familial feud after a loved one passes and assets are divided. Verbal promises become null and void once the person who made the pledge is gone — or perhaps those promises were never made to begin with. And even words written into legal wills can spark arguments and resentment for years to come. To avoid family upheaval after her future passing, my now-95-year-old grandmother took matters into her own hands.

About 13 years ago, my grandparents moved into a retirement community. As they packed up their home, they sorted through belongings, selling furniture and giving away items they no longer had space for. My…