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CaseSingularPlural
Nominativeименительный · кто? что?дедушка дедушки the subject: who or what acts
Accusativeвинительный · кого? что?дедушку дедушек the direct object of the verb
Genitiveродительный · кого? чего?дедушки дедушек possession, absence, "of"-phrases
Dativeдательный · кому? чему?дедушке дедушкам the receiver: to or for someone
Instrumentalтворительный · кем? чем?дедушкой дедушками the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?дедушке дедушках location and topics: in, at, about

Дедушка 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 дедушка 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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