My in-laws are coming to visit in 2 weeks - threads like these make me appreciate the unimportant topics we cover - weather, flowers, how's the job, etc. Once, FIL made some comment about how we SHOULD leave all our money to our nieces/nephews (we have no children). I made it very clear that how we spend our money and who we leave it to was none of his business. Has never made money comments since.
All in all, I have sensible in-laws, so I can't complain - they have budgeted well over the course of their life, haven't been extravagant, and are enjoying a nice retirement. The Aunt-in-law on the other hand, is a real piece of work... and unfortunately she's coming to visit, too. Should be interesting!