The actual number will be in the thousands or millions...what do you mean by related? We are all related to each other at some level... Though I always found it ironic that Hitler's relatives would settle in Long Island New York, which is heavily Jewish. One of Hitler's realtives even immigrated and served in the U.S. armed forces, so bloodlines mean little if anything.
Defense Ministry says had no knowledge of alleged improper defense deals by Gal Hirsch (Haaretz)
from the article: DNA study: Dozens of living Austrians are related to Hitler