Monroville:

If I also recall, didn't Shmi mention that Owen was her brother, and that is why Obi Wan gave Owen Luke to begin with? Of course, this conflicts with the ANH original story line that Owen was Kenobi's brother.

Well whatever the original ANH story is irrelevant, what ended up in the movie is, and there is no explicit indication whatsoever that Owen and Ben are related. In Attack of the Clones, Owen is clearly established as Anakin's step-brother - Owen's dad married Anakin's mother. So Anakin's son is Owen's nephew. Contrived as it is, that's how it is, Owen is indeed Luke's (step-) uncle. And it's Owen Lars, not Skywalker.