Who wears their kin on their skin?

Look at this sign. Why would anyone wear their kin on their skin? Hair and freckles are OK, but when it comes to your kin, you can't wear it on your skin. Your kin (family) is not something you'd wear on your skin. Neither is a tattoo - they're lamer than hell and they could get infected.

Whoever wears their kin on their skin has nothing better to do with their lives than wear their kin on their skin. If I had a choice between wearing my kin on my skin and having someone defecate in my cistern, then I'm taking the top off the cistern.