Hello! We are getting ready to assemble and mail out our invites (hooray!) and I'm still undecided about allowing some people to bring a guest. For example, one of my brothers has been dating a girl for about 6 months, and apparently she wants to come to the wedding. The thing is, I've never met her (brother lives in NJ), so I'm not sure if I'm supposed to invite her. I also have a cousin and several friends with similar situations - people who they've been dating but who I've never met. I feel like if I allow one person to bring a guest, I would have to allow everyone to do it, and that would add a ton of cost to the reception.
So who do I need to invite with a guest, and who can I invite by themselves? I am really stressing out about this, so I appreciate any feedback. Thanks so much!