Smiling siblings

That there are genes controlling cuteness, I suspected for a long time.

But, apparently, there are also genes for sparkling eyes, bright smiles and that unique twinkle in one's eye that is the mark of a smart and super fun person. How do I know this, you ask? It's obvious, if you look at this little sister and her big brother:

See what I mean?

Thanks for letting me take pictures of your brilliance, Emma and Alex!