Nancy Bronner's son, T.J. Mitchell, 17, died of cardiomyopathy in September 2012.
She says she is still disgusted by what she saw after his funeral.
"I opened the urn and found a Walmart bag in the urn. The funeral home had put my son's ashes in a Walmart bag," she told WCPO-TV, Cincinnati, Friday.
Bob McDaniel, director of the Dry Ridge, Ky., funeral home that handled Mitchell's funeral, said the family asked him to divide the ashes into four containers, which is unusual, and that he "used bags I had" after carefully trimming the bags to remove the store's name.
Thomas Mitchell, father of the deceased and ex-husband of Nancy Bronner, defended the funeral home's actions, saying it was "looking out for our best interest because the containers we provided did not seal."
Bronner says she is in therapy to deal with her son's death, and has contacted the Kentucky Attorney General and the state Board of Embalmers and Funeral Directors to file a complaint.