There's no such thing as Germanic blood. Germanic is a cultural and linguistic term, it has nothing to do with blood, especially as some people have changed from Celtic or Slavic to Germanic culture at an early stage, so the Germanic blood could just as well be Celtic. Or none of the above. You could say "Vandal blood", since that is a specific people, who may have had "other blood" than some of the other Germanic speaking peoples. Vandals could have been of Slavic origin, but with a Germanic language, for example. It's in fact not known, and nobody can claim anything with certainty.