A social worker had dropped the two blonde girls, who are biological sisters despite having different surnames, at their parental home on Friday for a scheduled visit.
According to earlier reports, shortly after the social worker dropped them off and then left, the Ferreira couple were allegedly seen leaving the premises with a travelling bag and their two young daughters.
The worried grandfather reported them missing a couple of hours later when they failed to return home, according to the police.
The children had been placed in their grandfather’s care because of alleged social problems at their parental home, he said.
Ngesi also confirmed that two counts of kidnapping were being investigated by the child protection unit.
Cradock police spokesperson Captain Lariane Jonker said investigations were still at a sensitive stage.
She said no arrests had been made by late on Monday afternoon.
She said due to the sensitivity of the investigation at this stage, she could not provide further comment.
“A full report will be sent out at a later stage,” she said.