I doubt it. Like @chyna , I have a family heirloom or two that might be worth some money. The few I know the value of wouldn’t amount to anything like a fortune, so the temptation to part with them isn’t very big compared to their sentimental value. I have a complete demitasse set that my great great grandmother brought with her to the US from England, but there are no maker’s marks on the set so looking up the value is almost impossible. I’d have to take it somewhere to be appraised, but it doesn’t seem worth the trouble of unpacking it and finding a reputable appraiser.
However, my mother-in-law has stated her intention of passing down to me her good silver. She has spent the past several years collecting a complete service for 12. The silver pattern originally belonged to either her mother or grandmother, I can’t remember which. She had it appraised many years ago, before adding to the collection, and it was quite valuable then. Whenever I inherit it, I will have it appraised for insurance purposes. I would have to be very desperate to sell it, but it would contribute quite nicely to a new car or a down payment on a house. ;)