Tom Riddle's Birth (Re: JKR Chat "The Crucial ...")

[drjuliehoward]

No: HPFGUIDX 93058

<snip> 
> Jen: JKR's comment on the chat indicates there are additional 
> circumstances about Tom Riddle's birth that we haven't heard. 
> Perhaps even *Tom* wasn't privvy to this information either? Diary!
> Tom in COS and LV at the graveyard are the two instances where we 
> get information about Tom's past. Assuming Tom was told much of 
his 
> history at the Muggle orphanage, then pieced together his own 
> version of events from digging around once he got to Hogwarts 
(where 
> he discovered he was Heir of Slytherin), I'd say there's a lot of 
> room for unintentional error and omission in his self-reported 
> history. 
> 
><snip>
> Jen Reese

I have read the books through only once, reading 3 and 5 twice, so 
my memory for canon is not as sharp as most on this website.  This 
post made me wonder...is there canon about HOW TR "discovered he was 
the Heir of Slytherin?"  I have often wondered how he knew.

Julie