IE & genes

In response to Marc Verhaegen:

Genetic 'evidence' is always interesting. In the case of Y-chromosomes, they are charting paternal DNA, father-to-son-to-son (and never to daughter), vs. mitochondrial DNA which is inherited by men and women both from their mother exclusively.

This kind of DNA study can indeed prove ancestry, but all it proves is paternity, and not what language the father spoke.