Newly released police dispatch audio captured the harrowing moments officers realized two maimed children allegedly strangled by their own mother in their Massachusetts home could not be saved. “There’s blood spatter everywhere,” an officer said Friday as he moved into the Wellesley home of Samuel and Janette R. MacAusland , where he’d found “a rear door unsecured” while conducting a welfare check. Kai and Ella were dead by April 22 – days before Wellesley police found their bodies in a bed inside their home, court docs reveal. Janette Reber / Facebook MacAusland once uploaded a sweet photo of her husband in bed with the kids, alongside the caption: “Happy Father’s Day to every dad that shows up.…