I think you have things mixed up. Bismarck was a junker prince who created Germany under Kaiser Wilhelm 1st from the core of Prussia. He annexed or persuaded Bohemia, Bavaria etc.,etc. into Germany.
The fall of the German monarchy was due to the idiocy of Wilhelm 2nd whose first and biggest mistake was to dismiss Bismarck from service as no longer relevant.
The House of Hohenzollern is a noble family and royal dynasty of electors, kings and emperors of Prussia, Germany and Romania. It originated in the area around the town of Hechingen in Swabia during the 11th century. They took their name from their ancestral home, the Burg Hohenzollern castle near Hechingen.
Being a Junker prince is not mutually exclusive with being a member of the Hohenzollern family.
Sorry, But Bismark did not create Germany.
Thanks for your information.