Dzień Babci i Dzień Dziadka

In Poland, Grandmother's Day (Polish: ) was created in 1964 by the "Kobieta i Życie" magazine, and popularized from 1965 onwards. It is celebrated on January 21. Grandfather's Day (Polish: Dzień Dziadka) is celebrated a day later, on January 22.

http://en.wikipedia.org/wiki/National_Grandparents_Day#Poland