They are fabulous, even with the damaged areas. What a treasure you have been given. While you can, gather as much information as you can about each and write it down, along with a picture of the quilt.
It may be possible to re-attach some of the borders and re-bind some of the areas. If the edges are frayed, just re-binding may be enough.
For the ones that have holes or missing fabric, try looking for some old flour/sugar/feed sack fabric at yard sales and flea markets (or possible some old quilts you can cut up) to get fabric to repair the holes. I would carefully wash them if they need it, then air dry. Use the fabric and applique over the damaged areas where possible.
There are people who specialize in re-storing, but I understand they are expensive. It may be necessary to just love them as they are. And they are beautiful.