I don’t think there are really any “sides” yet. Besides Henry, Mr. Gold, Regina, and August as far as we know no one else knows whats going on so there really isn’t anyone that can be choosing sides yet. As far as Sidney goes, I think he is just the “pet” Regina took on after she killed Graham. I don’t think he chose her side, I think he is really more of a pawn that she is manipulating and he doesn’t even realize it yet because he is into her – just like in FTL where he thought she loved him until after he killed the king and then he realized it was a set-up. I think Gold has his own agenda but I think that ultimately Emma, Henry, AND Regina are all going to somehow figure into that agenda because I think he is into this to destroy his own Dark Curse forever and I think the Dark Curse that Regina inacted may have been needed in order to do it. I think Henry only understands that the people are all fairy tale characters – he doesn’t understand the details of the curse to understand enough to even know what side to really be on and he doesn’t even know who Gold is in FTL at this point yet. And as far as August goes, I think he knows what is going to happen but is there to make sure everything runs the way it is supposed to not necessarily there to be on one side vs. another. I have a few theories about how this is all going to go down and I think the audience is being played a bit.