That's Ethan. He's normal looking, but his brother ages up strange.
No, those are the two Sims who are children at the start of the game. The way I play, I don't make over a Sim until after they age-transition (and then I try to keep to their style). I did install an "updated" Sunset Valley that had some of the later EP lots added, but I don't remember any mention of Sim-altering... but maybe that is the case.