This is the 4205th most frequent Polish word.
córek
The Polish word "córek" means "daughters" (genitive plural form).
The word 'córek' is used here in the genitive plural form to denote possession or relation, corresponding to 'of the daughters' or 'for the daughters'.
Mam dwie córki, więc kupiłem książki dla córek.
I have two daughters, so I bought books for my daughters.
Here, 'córek' is used in the genitive plural form to indicate ownership or relation, meaning 'of his daughters'.
Ojciec rozmawiał z nauczycielką swoich córek.
The father spoke with the teacher of his daughters.
The word 'córek' appears in the genitive plural to describe the connection of the photos to the daughters, as ‘photos of the daughters’.