This is the 8745th most frequent Polish word.
rodzinka
"Rodzinka" means "little family" or "close-knit family" in English.
'Rodzinka' is used here to refer to someone else's family in a casual tone, showing familiarity.
Czy twoja rodzinka wie o niespodziance?
Does your family know about the surprise?
In this context, 'rodzinka' indicates the attendees were from one's extended family, emphasizing the collective presence.
Na spotkaniu była prawie cała rodzinka.
Almost the whole family was at the meeting.
Here, 'rodzinka' refers to the speaker's family in an affectionate, informal manner.