A person who decleares Polish nationality and who cumulatively fulfils the following requirements: at least one of the person's parents or grandparents or two of great grandparents were Polish nationality, and the person shows her/his belonging to Polish character, in particular by nurturing Polish language, Polish traditions and customs

• Act of 9 November 2000 on Repatriation
  Place of publication: (Dz. U. 2019 poz. 1472, z późn. zm.)