I invited my aunt's mother (not my grandmother, my uncle's mother-in-law) to my bridal shower. I did not invite my aunt's sisters, but one of them came anyway and brought her daughter because aunt's mother needed a driver. Do we now need to add them to our wedding guest list? Adding them adds eight people to the list, all of whom will probably actually come. I felt bad about not inviting them in the first place, but we usually only see them once a year on Thanksgiving (sometimes not even then), and the list had to stop somewhere. We really cannot afford to add that many people, but I also don't want to be rude or offend them. Help?