Have you read the books? You're missing some key details (and don't know how to spell Voldemort).
The prophecy says the one with the power to vanquish the Dark Lord will be born at the end of July to people who thrice defied him, this means it could be either Harry or Neville, both born July 31st and both have parents who defied Voldemort three times (though we're never told what they did). Voldemort attacked Harry's family, with the sole intention of killing Harry, Harry's mom's love spared Harry. It's not so much weakness as Voldemort fulfilling the Prophecy by attacking the Potters.
Bellatrix tortured Neville's parents into insanity AFTER Voldemort's downfall.
The reason why people bring up Neville is he could easily have been in Harry's position if Voldemort attacked his family instead.