I have been reading the series over again and am currently on GOF hoping it will all connect by the time OOTP comes out just perfectly. I came across something that was neither convincing yet very possibly a clue as to Dumbledore being related to Harry. Here it is:
Mr. Crouch's eyes rolled forward onto Harry.
"Who....you?" He whispered.
"I'm a student at the school", said Harry, looking around at Krum for some help, but Krum was hanging back, looking extremely nervous.
"Your'e not......his?" Whispered crouch, his mouth sagging.
"No", said Harry, without the faintest idea what Crouch was talking about.
"Dumbledore's?"
Dumbledore's what I ask? Why was Crouch so suprised to see Harry.
Crouch says "Your not his? Dumbledore's?"
It sounded to me as I ran over it that Crouch knew that somehow Harry and Dumbledore were connected. By blood or by association who knows. Tell me what you think.