Some members of the Kurnatowski family were ardent members of the Polish Reformed Church , or Calvinists , producing a number of clergymen .
The Duisina and other family lines have remained Roman Catholic since at least the 13th century .
Some members of the Kurnatowski family were ardent members of the Polish Reformed Church , or Calvinists , producing a number of clergymen , although the Duisina and other family lines have remained Roman Catholic since at least the 13th century .