Grietje, Klaasje, Jenny and Marry, four sisters, who want to know whether their father is the biological father of Grietje and Klaasje; Petra 't Hoen, who wants to know if her father Cor is her biological father.

The story of 51-year-old Pieta. She is a descendant in a family of ten children. Rumor has it that her mother had an affair with a coal farmer at the time and there is a chance that Pieta is his daughter. She is the only one in the family with a completely different appearance, with red hair and freckles. Pieta hopes very much that she is the daughter of the coal farmer, because she did not have a good relationship with her father. Two sisters want to help her gain clarity. The (now deceased) coal farmer had a son and a daughter. Pieta had intensive contact with her alleged half-brother for a few months, until he passed away. Her alleged half-sister does not want contact, but she has anonymously donated DNA. This investigation may finally reveal whether Pieta is the coalman's daughter