My six year old has been doodle bug since birth because of how he sleeps. My oldest was gecko because when he was born his skin was so transparent he looked like a lizard. Right now, because if I call one, the other one answers, they are both just "no, the other one" or I just point say whichever one you are, come here. It goes something like this "Jacob..no I mean Caleb, no I meant... OH Crap, which ever one you are come here right now!"