How does DD know what Petunia/Vernon said?

[Bettie March]

No: HPFGUIDX 156703

>Brothergib wrote:

> >We have DD's comment that he has watched Harry more closely than he
> > knows, but we know that DD is at the ministry, so I don't think
> > the 'DD in animagus form' theory would work here.
> >
> > Fawkes? Patronus? Something else?
> >

Could it be that there is a photo on the wall somewhere of a wizard who 
alerts DD when Harry is in trouble?  Perhaps Petunia has been forced to 
alter her beautiful decor in some way to allow a wizard in to watch over 
Harry.

Bettiethebookworm