How to reply to an RSVP for a wedding invitation. You have received your wedding invitation and now you're ready to fill out the RSVP card which is included in the wedding invitation package. The RSVP card usually says we are looking forward to celebrating with you. The favor of a reply is requested on or before whatever the given date is. The way to fill it out if the invitation says no children are allowed and this invitation is sent to a family that has children, then they're only expecting the mother and the father to attend. In this case, you would say Mr. and Mrs. Cooper. You either will or you won't attend so you will just check out you will attend and you will put the number of guess which will be two which will only be you and Mrs. Cooper. If the wedding invitation says to Mr. and Mrs. Cooper and family and you know you can attend, you will then say Mr. and Mrs. Cooper will attend. You can always check it off the number of guess let's say there's five people in that household. Then you will put the number of guess as five. If you know that you can not attend, then of course you will just say will not be attending whether you're attending or whether you're not attending, It is very appropriate to send back the RSVP so that the bride knows how many people to expect. So, please send back your RSVP cards and that is how you would fill out an RSVP card.