You are very lucky to have such special quilt tops :D . I agree with what others had said about the dating of the tops. One thing to note is they are much more stable when made into a quilt. I would finish them with reproduction type fabric if you wanted to do a boarder and muslin or other backing. I would use cotton batting also and a quilt pattern that was popular during that time.
One other thing, do not iron or wash it. I would wait until the quilt is assembled if you have to wash it and do it carefully in the tub. You can find articles about caring for antique quilts on the web.
http://www.quilthistory.com/quilt_care.htm
This sight gives a good description on cleaning.
http://www.associatedcontent.com/art...ts.html?cat=24
Jstitch - the work you did on the quilt is beautiful. I appreciate the story.
Good luck and enjoy them as they were intended to be used by her family when she made them.
Lisa