I can't figure out how to add children to the guest list for each event so that they are still "attached" to their parents. When I create the party for each family in my wedding ceremony event, I add the spouse and children. However, when I try to add the same party to the rehearsal dinner, I get the option of adding the spouse and the children. I clicked to add both the spouse and the children, but it won't add the children. Why is this happening?