UNION COUNTY, N.C. -- The biological family of an 11-year-old boy found handcuffed to a front porch with a dead chicken tied around his neck say the boy had been abused in the past.

The boy's foster parents, Wanda Sue Larson and Dorian Harper, were arrested Friday.

Five children lived in the home.

Deputies described filthy conditions inside the home unsuitable for kids.

Larson is a supervisor at Child Protective Services at Union County Department of Social Services.

The boy's biological family believes Larson's position with D.S.S. is why their concerns have gone ignored.

We have, for over three years, been reporting to DSS of belt marks on the children. Hand prints on their faces. The children have been denied food, said Cindy Robbins.

Meanwhile, advocates are calling for a broader investigation into the county D.S.S.

I think personally, any case that she's signed off on within the past year should be reviewed again by an outside agency, said Jeremy Bess.

It's a case that is making national headlines. Monday, the NorthCarolina Department of Health and Human Services (DHHS) said they were watching the case closely:

The North Carolina Department of Health and Human Services takes the safety and well-being of every child very seriously, and has been closely monitoring the situation in Union County.

At the request of county social services officials, the Department will conduct a review of the county s processes and procedures to ensure the county s child welfare program adheres to proper standards and protocols as the local investigation continues.

Union County DSS issued a statement to NBC Charlotte, you can read the full document here.

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