I am quite sure that that is not who you think it is, just someone from that time period with a very similar hairstyle. A great-grandfather would be my guess.
Step 3: ask Yourself what are the odds that someone has a doppelganger Hitler grandfather
Step 4: ask Yourself who in their right fucking mind would put a picture/ portrait of their grandfather if he looked just like Hitler..
Step 5: ask yourself; why would a grandfather who looked just like Hitler; why would he give himself that hairstyle and give himself that mustache ... Grandfather must have heard of Hitler... no ?
Sorry, I'm not saying; that isn't Adolf Hitler, but your steps 3, 4, and 5 are a bit "eeehhh".
Step 3: ask Yourself what are the odds that someone has a doppelganger Hitler grandfather
In a population as large as ours there is a pretty good chance, that there is someone who looks a lot like Hitler.
Step 4: ask Yourself who in their right fucking mind would put a picture/ portrait of their grandfather if he looked just like Hitler..
Someone who doesn't hate their family member?... If my beloved grandpa resembled a bad historical figure, that wouldn't ever prevent me from hanging his picture on my wall. They'd have nothing in common apart from superficial apperance.
Step 5: ask yourself; why would a grandfather who looked just like Hitler; why would he give himself that hairstyle and give himself that mustache ... Grandfather must have heard of Hitler... no?
When is the picture from? Before the second world war that style of mustache and hair do were fairly common. Doesn't have to be a grandfather. Could just as well be a great grandfather...
Ok, so let me tell You something about Hitler ... He did lots of drugs, he aged and he obviously had different disease. Sooo; he looked a bit different year to year.
Now let me tell You something about portraits; they're made by different people and they don't always look on point or alike.