More off-topic, I find it creepy when I meet couples who look like each other and have a string of identical children.
I'm [genuinely] curious: do you find it creepy only for similar-appearing couples in your own race/ethnic group? Assuming you're not Japanese, for example, would you have that reaction to the sight of such a Japanese family?
This is not meant as a pejorative. My guess is that such a bias is probably common _within_ a race/ethnicity, but much less so when viewing couples/families of other races.
I bet you already knew this is what I meant and didn't actually need me to spell it out for you. As an aside, I read elsewhere that you and your wife are both from Western Europe. That's actually a lot closer than I had in mind; I said breed with someone who really doesn't look like you. :)