The sentence is written the other way round, this one may be less common but we wanted to show another grammatical construction:
"Kogo zna twój tata?" (Whom does your father know?) has "your father" as the subject. The answer is: "My father knows David Beckham!"
"Kto zna twojego tatę?" (Who knows your dad?) has "who" as the subject. The answer is: "Mr. Johnson knows my dad."