My wife recently visited a cemetary, and noticed a dual tombstone where the husband had died, while the wife was still alive. It looked something like this:
------------------------- /------------------------- / | | | John Smith | Mary Smith | | | | | Born: July 12, 1926 | Born: Sep 26, 1929 | | | | | Died: Feb 7, 1985 | Died: , 19 | | | | | | | | | |She better die in the next year or so.