The children go to free their grandparents Štěpán Zavřel Original bibliographical reference Grossvater Thomas, by Štěpán Zavřel, Bohem Press, Zurich, 1984 Other editions Nonno Tommaso, text and illustrations by Štěpán Zavřel, translated by Mafra Gagliardi, Bohem Press Italia, Trieste, 2012 Technique ink and watercolor Measures 24,5 x 19,8 cm Year 1983