This is the 7733rd most frequent Russian word.
зять
Brother-in-law or son-in-law.
The word "зять" here refers to the speaker's son-in-law, the husband of their daughter.
Мой зять работает юристом.
My son-in-law works as an attorney.
In this sentence, "зять" indicates the husband of the speaker's sibling, showcasing another possible relationship associated with the term.
Я познакомился с зятем на семейном ужине.
I met my brother-in-law for the first time at a family dinner.
This again refers to the son-in-law, emphasizing that "зятю" is the dative case of the noun "зять", used here to clarify who enjoys playing chess.