They are your quilts and you can certainly do what you want with them. However, will your memories be the same if you undo them and remake them? I bet you had some happy times snuggled under them, warm under the quilts and in your grandmother's love. Think first. Decide later. If you're just hiding them in the closet and would like to use them, well maybe it would be better to redo them. Afterall, I'm sure your grandmother would rather you use them and enjoy your memories then just stuff them in a dark closet.