Harry's Bood Relations (was Afterlife/Clue/Quirrell/, etc.)

[houyhnhnm102]

No: HPFGUIDX 171439

Catlady:

> However, if he was Harry's great-great-great-grandfather, 
> then he lied when he said the Dursleys were the only 
> relatives Harry had left.

houyhnhnm:

Dumbledore must have meant that the Dursleys were 
Harry's only living relatives within some arbitrary 
degree of kinship of which neither Harry nor the 
reader was informed.

How could Harry possibly have no blood relations 
within any degeree of kinship without the entire 
WW being wiped out (and much of Muggle Britain as well)?

So what would be the WW definition of consanguinity?
Everybody up to second cousin?  Third cousin?  One remove?
Two removes?  Anyone care to speculate?