Board Thread:General Discussion/@comment-98.218.70.24-20150317164438/@comment-26339753-20151022145433

DiegoAnime3000 wrote: There's also the fact that Yang herself didn't realize until she saw that picture. If it wasn't for that picture which was probably the same one we saw in the Opening then she wouldn't have realized that Summer is not her mother. After all, a picture of a person next to your mother, who looks more like you than your mother herself, is a pretty good hint.

Especially when Raven has a markedly similar appearance to Qrow, Yang's uncle, and also very similar names. They are obviously related, and to Yang, it would be a hop-skip-and a jump to find out how so.