Horst Kasner was in the Hitler Youths before serving in WW2 in 1945. He was a prisoner of war at some point and history shows he was on the east side of the wall.
Conclusion: The theory that Hitler's frozen sperm was used to impregnate Eva Braun's sister before the baby was given to Horst to raise has merit when you consider that Horst was a Soviet POW.
Angela Merkel's time in the East Berlin equivalent of the Hitler Youth suggests the Soviets intended to create and indoctrinate a leader as influencial as Hitler