Lately I have found that I am spending a bit more time on my backing - getting creative. Since the 2 aunts are close, I would do something on the back to tie them together. Perhaps a couple small squares of the other quilt or a small border. One thing I'm doing often is making a couple coin rows of all the bits left over and inserting them in the backing to enlarge it. This might be a way to pay homage to the other quilt. It would not distract from the quilt top but might give the aunts a little smile knowing it is there.