Most of my friends and family are a serious couple. I do have one friend and my twin sister that are not in a serious relationship. My sister has mentioned about bring her daughters father that no one in my family likes. We do not want him there, so it has been made clear that he is not allowed. I figure as long as my sister and one single friend know someone at the wedding, and they both know plenty, they do not have to HAVE a guest. We, like others, are trying to leave the list to just close family and friends and I really dont want people to bring someone just to bring them. Just my view.