Can you give me reliable WWII / Holocaust information?

several people mentioned the US Holocaust museum, its a wonderful website. But I have to agree that he probably isnt going to listen to anything you present him with. 11 million died. You can try to approach it that Hitler really broke alot of treaties, tried to take over the world but it seems to be that is 60 years later if people still think Hitler was misunderstood they arent changing their minds for no one. I dont know how old your daughter is, but tell him that subject is off limits with your daughter, you will agree to disagree.