How to get rid of a tombstone?

I'm not seeing that option. It's in the house inventory and build mode if that helps. But when I can go on again later maybe I'll try moving it to the garden and then destroying it and see if the option shows up at that point?

Put it in a tiny room and remove that room, that way you will be able to get rid of it even if there's no destroy option.

I always have a cemetery lot in my games. Currently, I have a maxis one on the empty lot in Forgotten Hollow. That way I don't have to clutter up my inventories and lots with urns and tombstones. This is the lot, in case anyone is interested.
https://www.ea.com/games/the-sims/the-sims-4/pc/gallery/436A56BBE34E11E6826ED1CF14F2BAD7?category=lots&searchtype=ea_origin_id&sortby=newest&time=all&searchquery=Maxis&max=50&maxis=false

I’m working on a cemetery/mausoleum lot for the 20x20 lot on Windenburg Island. Good place to park the carcass(es). ?

I had the tombstone of a non-family sim that died on my lot. I found the family and gave it to one of them as a friendly gift. They loved it!

You could possibly try to sledgehammer it in Build Mode?

In order to destroy you must place it on a lot. Its most likely from the temple someone died while a sim was at the temple in JA that is how tombstones get in family inventory.

Update... You guys I finally got rid of it! I didn't try anything different than before just placed it on the lot for a third time and this time the option showed up :-)

Thanks! I will let you know when I get a chance to try :)

Thanks!!!! I will do that if the destroy option doesn't work after I get a chance to play again tonight :)