"What’s fascinating–and a lot of fun, for some–is that by comparing these scattered landmarks, called SNPs or “snips,” you can get a very accurate picture of ho

"What’s fascinating–and a lot of fun, for some–is that by comparing these scattered landmarks, called SNPs or “snips,” you can get a very accurate picture of how closely related two people are." This directly contradicts the claim that these samples reveal nothing about your health or disease risk. Maybe it doesn't reveal anything in isolation, but if you know some medical history about some of my relatives and you have their DNA info, then that gives you some significant info about me too.