There seem to be a lot of life debts...

[vmonte]

No: HPFGUIDX 95257

Carol wrote:
JKR's words are "late in life." Dudley, who will still be seventeen at
the end of Book 7 (his birthday is in June) doesn't qualify. My bet is
Mrs. Figg, who definitely does. Surely a Squib with life-long contact
with the WW has more chance of accessing latent magical powers than a
boy we've constantly been informed is a Muggle like *both* of his
parents and *all* of his grandparents? (Lily, we're repeatedly told,
is Muggle-born. Petunia, we're repeatedly told, is just a Muggle.
Dudley, therefore, can't possibly be a Squib, which requires at least
one magical parent, or a latent Muggle-born wizard with the power
squashed out of him.)

vmonte responds:
I hope it's not Mrs. Figg, I would rather that it be Petunia than 
Mrs. Figg, because it would be the worst thing that could happen to 
Petunia, and that would be a really interesting read.  
I do have a question: I'm not sure why Dudley (or anyone for that 
matter) would have to be a Squib in order to gain magical powers 
later? By the way, just because we are informed that Dudley is a 
muggle (or Aunt Petunia for that matter) doesn't mean that they are.  
They are only thought to be muggles because they haven't yet shown 
any magical ability.