Board Thread:General Discussion/@comment-11464223-20131118032545/@comment-3536695-20131201053939

About the two Spinster sisters, someone on Facebook mentioned that they thought they might be two of the three fairies from Sleeping Beauty, like Flora and Flauna, and maybe Merryweather was missing. It makes sense when you think about the spinning wheels and how in the story Aurora/Briar Rose/Sleeping Beauty pricked her finger on the spindle of a spinning wheel.

I still stick to the Fates theory, but I like this theory as well.