No. 674 in Russian
сына
"Сына" means "of the son" (genitive case of "сын").
In a sentence
Я встретил сына друга в магазине.
I met a friend's son at the store.
Here, "сына" is used in the accusative case to denote the direct object of the verb "встретил".
У моей сестры есть сына.
My sister has a son.
In this sentence, "сына" is in the genitive case to indicate possession, as dictated by the structure of the phrase "есть сына".
Иван гордится успехами своего сына.
Ivan is proud of his son's achievements.
"Сына" appears in the genitive case to indicate a possessive relationship after the word "своего".
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