Seventh Son of a Seventh Son was created on 1988-04-11.

You would be the seventh child of your father who would have to be the seventh child of his family.

Yes

In the Middle Ages, the Seventh Son of a Seventh Son (or sometimes just the Seventh Son) was believed to be born a werewolf. The Seventh Daughter was believed to be a witch. This led to the killing of many Seventh children until the myth died out. However, another belief was instead of becoming a werewolf, the Seventh Son of a Seventh Son would be gifted in some way, more in-touch with the Unseen World, for example, the ability to see faeries or speak to the dead.

if you are the seventh son of the seventh son, you are, in some places and to some people, considered magical. It's really just an old legend