Strange boy at Riddle Manor

[karenoc1]

No: HPFGUIDX 101113

--- In HPforGrownups at yahoogroups.com, "burnoweatherhead" 
<kirklander368 at h...> wrote:

<snip> Also, who was the teenager Frank saw? Was it Tom Riddle? Or 
Harry using a time-turner from Books 6/7? I don't believe this has 
been explained, but apologies if it has.  Burno <<end snip>

Now karenoc1:
This has probably been mentioned before, but I think we can infer 
that Tom Riddle, Jr (or the wizard styling himself as Lord 
Voldemort!) killed his father and grandparents.  I don't have GoF in 
front of me now, but Barty Crouch, Jr mentioned similarities between 
himself and LV near the end of the book, like how they were both 
named for unsatisfactory fathers and how they both had the pleasure 
of killing those fathers.

I can't right now think of a reason why Harry would use a time-turner 
to go back in time to kill Tom Riddle Senior.  I guess I can't 
believe that Harry would do this at all, but I especially don't think 
he would want to kill Riddle Sr. *after* Tom Jr. had already been 
born.