A 33-year-old Bronx man was charged with manslaughter in connection with the death of his 3-year-old step grandson, with authorities alleging he beat the young boy to death last weekend. Now, the boy's mother is demanding an investigation into the city's Administration for Children’s Services, claiming that the child welfare agency put her child in his relatives' care despite her request that they put the boy in foster care.

Fernando Yensi, 33, was arrested on Thursday and charged with manslaughter of a person under the age of 11 after allegedly beating grandson Poseidon Quinones to death last Saturday. Poseidon had reportedly been living with Yensi and his grandmother, 46-year-old Madeline Yensi, after his mother, 21-year-old Ashley Ramirez, lost custody of him last year.

But Madeline Yensi had a note in her ACS file from 1998 for “inadequate guardianship” and “lack of supervision” of another child. And Ramirez says both she and the boy's father, Benjamin Quinones, were concerned about the boy being placed with the Yensi couple, with Quinones alleging Yensi had abused him when he was a teenager.

Ramirez says she had urged ACS to place Poseidon in foster care after she lost custody. "If his own mother is asking you to willingly put her child in the care of strangers, rather than that child’s own blood relatives, that should really tell you something," she told the Times.

A spokesperson for ACS told the Times that the agency "is conducting a full review of the case to determine what happened that led to this horrifying result."