Cops shoot suspect after he kills sleeping 13-year-old sister, wounds mom in Harlem shootout

G.N. MIllerPolice at the scene of a shootout at the Polo Ground Houses today. A cold-blooded Harlem man blew away his sleeping 13-year sister in her bed and critically wounded their mom before an NYPD officer shot him during a dramatic pursuit today, authorities said. And a classmate of…