"Hitler praised them as folkish tales showing children with sound racial instincts seeking racially pure marriage partners, and so strongly that the Allied forces warned against them"-Wiki
The Devil's Sooty Brother
...the King was so delighted with his playing, that he promised him his eldest daughter in marriage... she said, "Rather than do it, I would go into the deepest water." Then the King gave him the youngest, who was quite willing to do it to please her father, and thus the Devil's sooty brother got the King's daughter, and when the aged King died, the whole kingdom likewise.