Those quilts are just wonderful. Do you by any chance have a quilt appraiser near by? If you do, that may be the thing to do with them before you even try to repair them. They may be worth more by not doing anything but loving them. Just fold the worn spots out of sight and lay them on the back of a chair or something. Show them off, but keep them out of the direct sunlight.
They are beautiful, and should be seen. Do they have labels on them? If not, you could find out all the information and put one on each of them. Then later generations will know who made them and when.
Enjoy the history with them.