It's nonsense really. They didn't purposefully orchestrate for Adolf Hitler to rise to power, start WWII and purposefully lose it due to miracle bad luck with the weather.

Zionist movement was a whole movement bigger than the Rothschilds.

Hitler and the Nazis didn't just have a plan to move European Jews to Palestine, they also considered Madagascar, anywhere but German controlled Europe. The resources and support they gave the Zionists was minimal.

Hitler's grandmother working for a Rothschild household and becoming pregnant seems to be a story fabricated out of whole cloth.