I Researched My Family Ancestry

My son just did one of those DNA ancestry things from 23 and me. He just got the results back today, he is 48% French and German, 38% British and generally European, then there is the 2% North African from the Afar Tribe.....So we looked up his cousins on the internet, totally blew us away....I'm making bet's with my husband that it was his side of the family that went that way, he says no it was my mothers side you know those Germans.....I just find it facinating.