User blog comment:KressKross/Cinder is not Ruby's mom/@comment-1618120-20140624203819/@comment-3146930-20140624210948

Just going by the picture above, I wouldn't say that. Yang and Ruby are confirmed sisters; Yang has some limited fire abilities, Cinder's abilities are fire related; Cinder's dress is red and glows yellow when using her powers, Ruby's main color theme is red and Yang's is yellow; there was also something about eyebrows.

Anyway the point is they aren't just comparing hair color, but things that Ruby-Yang have in common with Cinder. Sure Jaune has the same hair as Yang, but there are no hints of being related and he doesn't really have anything in common with Cinder power wise. I'm also not really seeing why Pyrrha and Ruby would be related by the logic.