Yes, I did read the documents. And of course, there were no written guarantees of future value. The same applies to virtually any investment you'll ever make. BUT, you don't buy stocks or bonds, and mentally write the principal off the day you buy. Similarly, the Marriott salespeople talked (and talked, and talked) stable or increasing value, and most people (including me) swallowed that line.I'm surprised if this was important to you that you would not have looked at the documents.
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you bought a share of a property in perpetuity, and that is what you have. Even then, there were disclosures that there was no guarantee of value in the future.
I truly doubt you were willing to instantly chalk this investment off either. I suspect the "life style" analysis came considerably later.
By the way, make sure your children actually want this gift; maybe they'll beg you not to burden them with the Marriott lifestyle.