“Een zuster van Jeroen Bosch” (F.W. Smulders) 1955
[in: De Brabantse Leeuw, 4 (1955), pp. 97-99]
[Also mentioned in Gibson 1983: 30 (B20)]
Smulders quotes a number of archival sources from the Bosch Protocol regarding Bosch and his family. From these we learn that apart from two brothers (Jan and Goossen) Bosch also had a sister (Herberta).