I have found that Blue Dawn, peroxide and baking soda will take out any stains that I have encountered. I usually lightly dampen, put Blue dawn directly on it, spray peroxide and then sprinkle baking soda and then spray peroxide to make a paste and then lightly rub with a soft brush (I usually use an old toothbrush). Then wash in machine or in your case, rinse thoroughly. Since the material is so old, I would do an edge of whatever you use to do a test drive.
I pray that these heirloom quilts will be salvaged. If not, you might consider framing pieces.