CLEVELAND, Ohio (WKBN) – Cuyahoga County social workers are responding to claims they let a family fall through the cracks before police arrested a mother for the suspected death of her 5-year-old son.

According to WJW Fox in Cleveland, the Cleveland Division of Police arrested Larissa Rodriguez, but she has not been charged. On Tuesday, investigators found human remains in the backyard of her West 80th Street house believed to be those of a child.

The cause of death and positive identification are still pending.

Mary Louise Madigan, a spokesperson for Cuyahoga County, said the last complaint about the family came to the agency last December. That led to visits from a case worker.

The last visit to the home was done in February. At the time, the case was closed.

At the scene, relatives of the mother cried out they had called a child welfare hotline and nothing was done.

The county said it has dealt with Rodriguez since 1999 for complaints ranging from neglect to physical abuse. Over that time, workers have taken 18 calls about the mother, resulting in 13 investigations.

Child welfare workers said they have provided parenting education, mental health services and more.

Rodriguez has nine children and she is pregnant again.

In the past, the county took two children away permanently. Two other children have been with their fathers.

In light of the seriousness of the case, and the long, tangled history, the county is now doing an intensive, internal review looking back at every referral and contact case workers have had with the family.