Board Thread:General Discussion/@comment-26099499-20150226151824/@comment-25555436-20150226171912

"By appearance"...now you're starting to make me laugh. Because of the art-style, detecting a character's age is harder. Glynda looks around her 30s, yet could be in her 40s. Ozpin looks like he's in his mid 30s, yet he likely is older than that. Ruby is 15, yet through appearances alone she looks closer to 13-14, and Weiss despite being 17 looks closer to 15-16.

To make things harder, there are tropes commonly used in anime (which this show was inspired by). "Younger than they look", for example: A character looks much younger than they really are. Mothers specially are prone to this in anime; thousands of times, when a character's mother appears, they look so young other characters (and sometimes the audience) think she is the character's sister. Sometimes they even look younger than that.

As such, your idea of making "Raven=Yang's mom" "very doubtful", because of her appearance, becomes a stupid decision on your part.