Hitler and Loret have the same blood group. Another study showed that their handwritings are similar.
Additionally, in 2009 the Daily Mail reported on a study that supposedly collected Hitler's DNA from:
...forgotten cigarette butts in a small village in Lower Austria, a used paper napkin in a New York fast food restaurant and the seals of letters sent over 30 years ago from northern France.
Are there really no more credible sources of Adolf Hitler's DNA?