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Could be debunked but still interesting. --A horcrux only affects a person if they wear it or have an emotional attachment to it. The Dursleys didn't want Harry to begin with. So they had no emotional attachment to him. Ron was affected while wearing it. Ginny was obviously emotionally attached. A horcrux doesn't effect everyone it encounters, otherwise all the people that were around Harry would have been affected- like Ron, Hermione, Sirius, & the rest of the Gryff's...