Everyone thought they were twins because they are identical. In real life there are no ordinary brothers who look so much alike.
Everyone thought, they were twins, because nobody was looking good enough at them, the women are in the focus, or everyone is blind xD
That's my opinion.
Because they are looking not even close to somewhat that could be called identical!
They have not the same height, clearly visible in the episode 13, picture, when they are standing side by side on the way, Kelly is a little bit more in front of them...
Yeah, their magic-sticks are also not the same size...
Just for protocoll....
Is this bad, that many didn't recognize it - no, not for me... have fun! xD