In general I understand that anyone over 18 should receive their own invitation. We are definitely planning to send a separate invitation to anyone who is engaged including their fiance/e. However, we will be inviting many families who have college age children who do not yet have their own address. In some cases we want to invite all of the children, in other cases we want to invite only the parents and one of the children. If we send a separate invitation to everyone over 18, in some cases we will be sending 3 or more invitations to the same household. This really seems like overkill and has a big impact on my invitation and postage budget. We do not plan to include a guest for each single person invited. Any recommendations?