Add to that the fact that our brother NBTX11 seems like a solid honorable Christian husband, and father, and the potential "sister wife" a beloved friend and relative. It looks like a reasonable possibility.NBTX11 mentioned that this woman has never been married, and that she was best friends with his wife in highschool. That would mean her age is almost certainly well north of forty. In less polite (but more honest) times, she would have been called an "old maid". That seems like a good reason to be open to poly. Sharing a man makes more sense than dying alone surrounded by cats.