Of their five sons, the four youngest would become artists: Gillis, Pieter and Antoon became painters while Ambrosius became a master goldsmith.
In any case, it could explain the share of Pieter I Claeissens in the Spanish export market of works of art, where Benson is the leading artist.
Only in 2003 was it proven that works signed 'Petrus Nicolai Moraulus' were actually by the hand of Pieter Claeissens the Elder.
The panels of the triptych executed in 1576 are now in the Museum of Fine Arts in Budapest, where they are still attributed to Pieter Claeissens the Elder.
[5] The Claeissens workshop produced works in which the influence of the painters Adriaen Isenbrandt and Ambrosius Benson who were active in Bruges as well as the modernizing tendencies of the Pieter Pourbus are transformed into a personal style.