Right, except that in real phylogenetic analysis, the kind involving actual genes, it's known that among multi-cellular eukaryotes vertical gene transfer (ancestor to descendant) is the overwhelming mechanism by which genes propagate. However, stories don't just pass from one generation to the next. They also transfer horizontally (peer to peer), which is going to muddy things, especially since global communication has been around for over a century now and has only been getting more commonplace since then.