Antoni (Anton Grigorievich) Kontski and Apolinary Kontski were brothers born into a prominent family of Polish musicians. Both were sons of the violinist and composer Grzegorz (Grigory) Kontski and grew up in an environment that strongly shaped their musical careers. Antoni was born in 1817 in Krakow, while Apolinary was born in 1825 in Warsaw, placing them eight years apart in age.
As members of the same musical family, their early development was closely connected, and both benefited from their father's instruction before pursuing distinguished careers in different musical fields—Antoni as a pianist and composer, and Apolinary as a violinist, composer, and pedagogue. Their shared heritage and artistic upbringing linked them within the broader cultural sphere of 19th‑century Polish and Russian music, even though the article does not describe direct professional collaboration between the two.