What are my rights? My business partner just died and had no will. His wife and children are giving me a hard time. Please help...

First, I'm assuming you and your business partner owned these as a corporate entity.  Next, I’m assuming on these facts you and your business partner never had an operating agreement, by-laws, or a partnership agreement (depending on the entity) drafted.  If you did, dust off the document and head to a lawyer’s office with it in hand – it should have the answer to your questions (and hopefully the protection you are looking for).  If you didn’t have something drafted, I'd say the ownership documents on the booths may have something in them potentially.  If not, the next place would be looking for hope in the FL statutes and case law.  That said, these situations get messy quickly if dealt with improperly.  I would highly suggest meeting with an attorney to see where you stand and, if possible, hire to help negotiate, defend, or whatever the case may be in the end.