My nephew has taken an Ancestry DNA, what will this tell me?

Question

I need to convince him to post his DNA to your site.  Any arguments I can make?

Comments

That depends on which tests he took and how he is related to you. Is he the son of your brother or your sister? Has he just done an Ancestry autosomal test or has he also tested elsewhere for Y-DNA as your tags suggest?

Answer 1

Ancestry's test is autosomal.  It won't tell you anything for sure, but it will help you to locate cousins.  Your centimorgan count will tell you at what level of relationship you may have with another person.  The higher the centimorgan count the more reliable the match.  There are a number of good books on using DNA.  You will have to do some hunting to find the centamorgan count on the Ancestry website, but its there.  Go to the matching persons name and click on the small i.