Didn’t Hitler have a relationship with his cousin?
I believe it was his niece. She committed suicide which probably had an effect on his mental stability.
When last I talked to him, he didn't say.
It’s speculated that he was obsessed with his niece and may have had a relationship with her. Then again, the original source for the rumors about a relationship was, I believe, the OSS, and one of their specialties was putting out propaganda so who knows?
She did live with Hitler for a while and committed suicide in his apartment though.