User blog comment:Samuelshadow16/Are Ruby and Yang Blood Related/@comment-76.175.139.65-20140801101916

Ok so Monty said they're not blood related but he still said they're sisters so my guess is because if that head stone shown in "red" trailer a parent if ruby's may have died and yangs family took her in but they are not blood because of what Monty said and they don't have the same last name but this is a theory I hope we get to see the truth soon because its driving me crazy