The grieving families of kids who died under the watch of the Big Apple’s child-welfare agency say a scathing new city report proves what they already know — nothing has changed. The damning probe by the Department of Investigation revealed that the embattled Administration for Children’s Services has continually blocked investigators from examining the abuse and deaths of dozens of innocent youngsters in its care, leaving the door open for more tragic outcomes, victims’ relatives lamented to The Post. “When a kid dies, someone has to pay for that,” said Nyisha Ragsdale, whose 4-year-old nephew Jahmeik Moldin was found starved to death inside his family’s Harlem apartment in 2024. A scathing new city investigation slammed the Administration for Children’s Services for keeping child-death cases private. Robert Mecea The tragic tot’s mom, Nytavia Ragsdale, is awaiting trial on murder and manslaughter charges. “My sister had previous cases,” Nyisha Ragsdale told The Post. “They got reported.…