DH has a very similar story to Khan's. His Aunt Emma never married and spent her entire career with one employer, where she rose to a senior managment position. She retired at age 62 and lived to 90. Shortly after she retired, she let her future heirs (her nephew my husband, and five or six distant cousins, none of whom lived within a thousand miles) know that "someday, everything would be theirs." As she lived close by and DH was to be her personal representative, we had a good understanding of what that "everything" really meant. The others apparently thought they were in line to become instant millionaires.
For the first twenty years of her retirement, Aunt Emma really enjoyed her retirement -- traveling around the world with friends, splurging on a few luxuries, etc. -- and it was wonderful to see her so happy. In her last years, however, some significant health issues forced her to move to an assisted living facility and by the time she died, her "everything" was valued at less than $25,000.
At her death, the distant relatives demanded their shares of the "hundreds of thousands of dollars" that Aunt Emma "must have had." (After all, they pointed out, she did live a pretty high-flying life." Or so they thought from her postcards and notes.) After the audit of her estate, when DH notified the other heirs that their shares would be less than $5K each, one of the cousins filed a formal complaint with the probate court, claimed we siphoned off assets, etc. [In reality, toward the end of her life, we were supplementing her income to pay her bills.] DH ended up resigning as personal rep of the estate...the squabble among the other heirs went on for several years...and in the end, no one got anything as the small estate was spent on attorney fees, audits, etc.
We ended up with a box of personal papers and a desk that she bought on her first trip to the Orient (which we treasure)...everyone else got nothing but hard feelings.
Moral: I never would count on any inheritance until the check cleared.