If there are bags that you are going to go to baggage claim and get yourself, then do not put the yellow DME tags on them.
Each person who is listed on the reservation will get two luggage tags from DME. They assume that most airlines will allow two pieces of checked luggage per person. So....if you have the grandparents, go with the kids, on the DME bus and the other adults go get the rental car, how much luggage will be actually tagged for DME transport? We seldom need two bags apiece. So....you will have tags for 7, total of 14 of them. Will you really have 14 bags? Or are you just concerned with having some bags available to you upon checkin? If this is the case, leave that particular bag untagged, but tag all those you can do without for a few hours. Let DME take care of those bags, and you guys have a fun time hopping on the bus. Hope that's somewhat clear.