This is the 14930th most frequent Polish word.
rodzeństwo
Siblings.
Here, 'rodzeństwo' refers collectively to all siblings of the speaker without specifying number or gender.
Moje rodzeństwo mieszka w Krakowie.
My siblings live in Kraków.
In this sentence, 'rodzeństwem' is the instrumental case of 'rodzeństwo,' referring to the engagement in activities with siblings.
Z rodzeństwem często chodzimy na spacery.
I often go for walks with my siblings.
In this context, 'rodzeństwo' is used in the nominative case as the subject of the inquiry about sibling visits.