Was Adolf Hitler the only crazy one of his family or was it genetic?

Also if you could tell me if there is any evidence of who Alois Hitler's (Adolf's dad) birth father was? I have read that his stepfather Johann Georg Hiedler or his brother might have been Alois' birth father which worries me because I'm related to the Hiedlers and I don't want to think I have Adolf Hitler blood in my veins *shudder*.