We are working on save-the-dates and the guest list is with FI's family to fill in some of the blanks in names we had listed. FI has a cousin (I think in his early 20s) who had a child with someone and is now dating someone else. I'm thinking that we are inviting him, his current girlfriend and his child, but I have no idea how that would be worded. We are not planning on inviting his child's mother because we aren't sure if they even still speak to each other. I'm not really sure if they were in a relationship or if the child had just kind of happened. Any thoughts?