Yup. Catherine Oxenburg (actress from 'Dynasty') and her daughter India went to a couple NXIVM 'intensives' (classes). India kept going while Catherine bowed out. Catherine later spent quite a bit of effort to get India out of the cult. She was successful and wrote a book about it called "Captive".
India was just about lost to Raniere's sick teachings and if Catherine hadn't gotten her out of NXIVM she probably would have been on trial with the others.
Catherine and Christina are descended from King George and the Tsars in their bloodline through their mother.
Yugoslavia was a nation with royalty? I thought it was a creation of Tito. Before WW1, it was divided between Austria-Hungary and the Turks. After WW1, I think they created a bunch of independent states. Whatever they were between the wars, I doubt the allies set up new monarchies in the wake of WW1. But I don't remember specifically.