So when I originally did my rough draft of guest list to see the maximum number of people who could show up I gave everyone over 16 a plus one to make sure we would have room. Now that we are closer to addressing and sending invites who should get a "and guest on invite?" My main question is the list my FMIL gave me some people have "and guest" some don't and I don't know if the people are 16 or 90. She invited our future neighbors (FI's current neighbors) and the majority of them are in their 80s and widowed. She did not have and guest for these ladies.
All of my great aunts are widowed and have been for years. One of them has lots of "male friends" so she is getting and guest. But some have been single since their husbands past years ago.
Is this a case by case basis or a set rule/guide?
Obviously if I know they are dating someone that persons name goes on the invite. I'm asking about the ones who are single.
*edited for clarity