A Newburgh boy was apparently shot dead in his home by another child in a twisted act of revenge for an earlier shooting involving the victim’s older brother, a source told The Post. Friends and family identified the 11-year-old victim Saturday by his first name, Matthew. Matthew was inside his family’s North Miller Street with three other kids, all under the age of 18, when the alleged killer — who was just 13 — allegedly pulled the trigger, Orange County DA David Hoovler told The Post