Mr. Bandman. Perhaps we are two nations separated by a common language.
You have presented an argument that involves Harry, and Dudley being descended from Godric Gryffindor. In supporting your argument you have proposed that Godric’s Hollow may have been the Gryffindor family estate, and well it might. You have proposed that the Gryffindor bloodline runs through the Evans family, which I can see no evidence for.
Using quotes from the books and from several of JKR’s interviews I have tried to clarify what we know about Harry’s family. When I say that the “immediate problem” with your theory is that both cannon and comments indicate that the Potter’s wealth, probably including Godric’s Hollow, come via the Potter lineage and not the Evans lineage simply means that that is something that needs to be explained. It is not that your idea is wrong it is rather that it is not supported by evidence.
JKR has said that Harry’s grandparents are all dead and not particularly important to the story, although you will find out a little bit more. She has also said that we will learn more about James’ family in later books.
[QUOTE="The Leaky Cauldron and Mugglenet interview Joanne Kathleen Rowling: Part Three," The Leaky Cauldron, 16 July 2005}MA: His family?
JKR: Family, yes.
MA: Should we talk about that a little more?
JKR: No. But you can! [Laughter.]
MA: What about Harry's family — his grandparents — were they killed?
JKR: No. This takes us into more mundane territory. As a writer, it was more interesting, plot-wise, if Harry was completely alone. So I rather ruthlessly disposed of his entire family apart from Aunt Petunia. I mean, James and Lily are massively important to the plot, of course, but the grandparents? No. And, because I do like my backstory: Petunia and Lily's parents, normal Muggle death. James's parents were elderly, were getting on a little when he was born, which explains the only child, very pampered, had-him-late-in-life-so-he's-an-extra-treasure, as often happens, I think. They were old in wizarding terms, and they died. They succumbed to a wizarding illness. That's as far as it goes. There's nothing serious or sinister about those deaths. I just needed them out of the way so I killed them.
MA: That sort of shuts down Heir of Gryffindor [theories], as well.
JKR: [Pause.] Yeah. Well - yeah.[/QUOTE]
You mention in the last post that the Evans’ would be “terrified to have a witch in the family” this has been addressed by JKR.
JKR. World Book Day 2004 said:
HPFreak7: How are muggle parents convinced to let their kids go to Hogwarts, a strange place they never heard of before; and wouldn't they think it was a practical joke?
JK Rowling replies -> In the case of Muggle parents, special messengers are sent to explain everything to them. But don't forget that they will have noticed that there's something strange about their child for the previous ten years, so it won't come as a complete bolt from the blue.
I guess that this applied to Hermione’s parents, the Creevey brothers’ parents, Justin Finch Fletchley’s parents et al.
JKR has said that had Lily moved aside and allowed Voldemort to kill Harry she would have lived and this would not support the idea of ending a bloodline, had it existed, and had it gone through the Evans family.
[QUOTE="The Leaky Cauldron and MuggleNet interview Joanne Kathleen Rowling: Part One," The Leaky Cauldron, 16 July 2005]ES: This is one of my burning questions since the third book - why did Voldemort offer Lily so many chances to live? Would he actually have let her live?
JKR: Mmhm.
ES: Why?
JKR: [silence] Can't tell you. But he did offer, you're absolutely right. Don't you want to ask me why James's death didn't protect Lily and Harry? There’s your answer, you've just answered your own question, because she could have lived and chose to die. James was going to be killed anyway. Do you see what I mean? I’m not saying James wasn't ready to; he died trying to protect his family but he was going to be murdered anyway. He had no - he wasn't given a choice, so he rushed into it in a kind of animal way, I think there are distinctions in courage. James was immensely brave. But the caliber of Lily's bravery was, I think in this instance, higher because she could have saved herself. Now any mother, any normal mother would have done what Lily did. So in that sense her courage too was of an animal quality but she was given time to choose. James wasn't. It's like an intruder entering your house, isn't it? You would instinctively rush them. But if in cold blood you were told, "Get out of the way," you know, what would you do? I mean, I don't think any mother would stand aside from their child. But does that answer it? She did very consciously lay down her life. She had a clear choice –[/QUOTE]
I am sorry that you felt that I dismissed your argument, which may have been the case had I not supported my arguments with evidence from books and interviews. I look forward to seeing the supporting evidence for the ideas that you have put forward.