Harry & Hermione Siblings?

[nobodysrib]

No: HPFGUIDX 53522

Harry and Hermione could also be (fraternal) twins.  If they were 
separated at birth and Hermione was hidden away in a muggle home, it 
wouldn't be a far stretch to falsify her birth certificate.  (If Mr. 
and Mrs. Granger are in on the plan, they might also know Hermione's 
real birthday.)

The magical quill that records the names of all witches and wizards 
at birth would certainly know about this, as would any Hogwarts 
teacher that happened to read through it.

Also, if Hermione were given to the Grangers prior to her being named 
by the Potters, then there needn't be any "rewriting" by the quill of 
her name, location, etc.

IMHO this is all too Star Wars for me, and I think JKR will have more 
clever plot twists ahead of us... but she also may be clever enough 
to take this idea and make it original.  (For example, I cannot see 
her having a scene in which Ron, jealous of the connection between 
Harry and Hermione, accuses Harry of stealing his girl, and Harry 
replies, "she's my sister.")

(Also, if there are any Greek, Roman, etc. myths about twins 
separated for protective reasons, she may be working off of this 
rather than directly ripping off Lucas.)

- Nobody's Rib