There's also family invitations, which don't require friendship to turn up in your mailbox. Please see post #22.
Just because it is a relative doesn’t mean I’m going to attend or acknowledge. I have a couple of gay cousins. Didn’t care to associate with them when I was a kid and didn’t know what was up and I don’t today. In the past 25 years, I saw them from afar once at their pos father’s funeral and didn’t speak to them. In fact, didn’t want to attend the funeral so stayed at the car and was only there to chauffer an elderly relative. The female one is a HS girls coach - imagine that. The male one wears tassels on his shoes and posts pictures of him posing pretty with his dogs.