Board Thread:General Discussion/@comment-184.57.236.76-20130730210222/@comment-23784953-20130803000939

Kyra Xyrespace wrote: @Creator - actually, Monty said that none of the girls are blood related to each other. Ruby is adopted; it's the only other option. Their backstories will probably be explained close to the end of the season (like a true anime). We have no clear confirmation that it's Ruby that's adopted. For all we know, Yang was adopted two years before Ruby was born.

Though that's just me nitpicking. Ruby being the adopted one has a higher possibility than Yang being adopted.

Now I seriously wanna see a backstory episode focusing on the R&Y siblings.