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CaseSingularPlural
Nominativeименительный · кто? что?внук внуки the subject: who or what acts
Accusativeвинительный · кого? что?внука внуков the direct object of the verb
Genitiveродительный · кого? чего?внука внуков possession, absence, "of"-phrases
Dativeдательный · кому? чему?внуку внукам the receiver: to or for someone
Instrumentalтворительный · кем? чем?внуком внуками the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?внуке внуках location and topics: in, at, about

Внук is animate, so its accusative copies the genitive: the form after "I see..." matches the form after "of".

Look up any other word in the Russian declension tool, see where внук ranks in the most common Russian words, or start from Russian cases explained if the table above is new territory. More vocabulary lives in Russian words by topic and Russian phrases.

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