Here's how some backwoods yokels handled this situation:
Years ago my ex-DWs grandmother died. Grandma was a cruel, manipulative woman who promised the same non-financial items to her five vile heirs. (Grampa had died young, I suspect because he wanted to). "She promised me the grandfather clock in 1967, so any claims after that are void". "No, she promised ME the grandfather clock in 1981, so that supersedes your earlier claim". She did this with most of her belongings, but of course not in writing or around witnesses. So some heirs solved the problem themselves by breaking into grandma's house and robbing it. The heirs who lived farther away couldn't get to grandma's house fast enough to take the prime stuff, so they showed up in a second wave, filled with spite, and took everything not nailed down.
Poof! Non-financial assets - what non-financial assets?
LOL....long line of "Grabbersons"?
How are the Holidays when the far away relatives visit?
I see grandmas crystal goblets on the table. You know she promised me those! <slipping a couple in their pocket>