(CNN)  -- Trading two children for a bird landed three people in jail in Louisiana, authorities say. The biological mother, who was not involved in the alleged trade, is to be interviewed by authorities Friday. Investigators seek further details about a case that they say unfolded this way: Paul and Brandy Romero advertised that they were selling their pet cockatoo for $1,500. A woman named Donna Greenwell responded and said she wanted to buy the bird. Greenwell then told the Romeros that she was taking care of three children whose biological parents were going through a separation. Greenwell proposed selling two of the couple's children to the Romeros for $2,000, saying that her job as a truck driver made it hard to take care of the children, said Capt. Keith Dupre of the Evangeline Parrish Sheriff's Office in Louisiana.
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Paul and Brandy Romero advertised the sale of their pet cockatoo for $1,500
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Donna Greenwell offered two children, who were not her own, for payment
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Greenwell and the Romeros were arrested and charged with aggravated kidnapping
She had placed the third child with another @placeholder couple, Dupre said, but he didn't know whether bartering was involved.