Talk:"Yellow" Trailer/@comment-19541665-20130927110049/@comment-96.254.157.84-20140802041826

Summer is Ruby's mother, not Yang's. Same father, different mothers.

And I think that might be why the have different last names. Maybe in Remnant, boys take their father's surname and girls take their mother's. Ruby is Rose after Summer Rose and Yang is Xiao-Long from her mother.

That's my theory anyway.