The more you think about it, the less sense it makes, actually. Ron and Hermione spent plenty of time around Harry and never turned out that way. Yeah, Ron got jealous, but that was because of Harry's fame.
I thought this was going to end with it saying something like "now imagine what would happen if a horocrux lived inside you your entire life" with a picture of Harry
https://www.pottermore.com/writing-by-jk-rowling/vernon-and-petunia-dursley