"I remember my dad."
Translation:Pamiętam mojego tatę.
"pamiętać" (to remember) takes Accusative. "tata" denotes a person, so it is an animate noun. Accusative of masculine nouns is the only situation when it matters whether the noun is animate or not. If it is, its Accusative is identical to Genitive, if it's not, its Accusative is identical to Nominative.