My aunt and uncle and their family were planning on visiting his widowed mother immediately prior to my wedding and driving down from there, so they wanted to know if his mother could come. As a courtesy, I said yes and sent her a save-the-date, even though I've ony met her a few time and am not close with her at all. While the save-the-date is in the mail, my relatives tell me they're no longer visiting this woman anymore, but that she's planning on coming anyway and not only that but bringing her 50-year-old son that's just gotten divorced and moved back in with her! I don't even know this man! My fiance and I are paying for most of the wedding ourselves so our guest list is limited and I feel like I've already been more than accommodating but this is where I draw the line. If the mother comes alone it's not like she won't know anyone or won't be the only "single" person there - I won't be asking my single guests to bring dates. I haven't even mailed the invitations and already my relatives are assuming so much! Is there anything I can do? My fiance isn't much help in that he doesn't care much about wedding etiquette and thinks we should tell them both to hit the road.