Poor kid.
It sucks that people are so fucking rude - I don't think I would have thought twice about them being twins. It wasn't their fault. My mind would have automatically supplied "artificial insemination" and gone on.
Not sure exactly where they live, maybe racism is more prevalent there. Or maybe people are just more rude.
I feel for the whole family. He's a cute kid, and he does look like his mom in a lot of ways.