The two languages that I call my "equally first" are Ukrainian and Russian. Ukrainian was the only language of my retired grandfather who spent as much time and effort to raise me as my parents did (if not more), and Russian was the language of my parents. The first children's books that I read were, again, in Ukrainian and in Russian. Growing up in Kyiv, the capital of the Soviet Ukraine, a city that was terribly Russified, I heard and used mostly Russian; but then I married a girl from Volyn', a part of Ukraine that retained its "Ukrainianness" better, and I switched entirely to Ukrainian at home.
English is the language I learned at school; it is the language I currently use in my everyday work and communication with Americans. The other two foreign languages I have "some idea about" (can read and understand with the help of a dictionary, albeit cannot speak fluently myself) are French and Spanish.
Certainly, being a Slav, I can recognize many words written or spoken in Polish, Czech, Slovakian, Bulgarian, etc.