This is the 15917th most frequent Polish word.
teściów
"Teściów" is the genitive or accusative plural form of "teściowie," which means "parents-in-law" (mother-in-law and father-in-law) in English.
Teściów is used to refer to someone's in-laws collectively.
Wczoraj byliśmy z wizytą u moich teściów.
Yesterday we visited my in-laws.
Teściów is used to refer to the in-laws of a specific person, indicating familial connections.
Teściów mojej siostry spotkaliśmy na weselu.
We met my sister's in-laws at the wedding.
Teściów is in the grammatical form indicating motion towards or interaction with the in-laws.