Potential Spoilers for Volume 6.
Please note: I know this is a crazy theory/more than likely not a real thing. But just food for thought. Feel Free to debate.
I had a strange thought. All Semblances are different from their parents. Except for the Schnee family, whose semblance is hereditary.
Is it possible that maybe Weiss is related to Salem/Ozpin? I only say this because we have seen that the Magic those two carry is hereditary. (Maybe this is from mixing magic with semblance?) In Volume 3 when Winter is demonstrating the glyph as a muscle to Weiss it does look similar to when Salem holds out her hand to show she has magic in Chapter 3. (Probably just reusing an animation) But if you replaced the glyph with the magic or vice versa it looks similar.
Also to note. Ozpin/Salem only had daughters, so only girls have been shown to use magic (within the new world, although would assume if they had a son, he would use magic). Then the use of Glyphs has only been used by the daughters of the Schnee family.
Otherwise, Maybe the mixing of magic with normal humans is what created semblances. making everyone a descendant of Ozpin and Salem.