What is a collective term for first cousins?
Everywhere I've looked it is emphasized that the correct term for "cousin" depends on age, sex and whether the cousin is on father's or mother's side. But that's for individual cousins. And the closer I've found to a collective term is 堂兄弟，堂姊妹，表兄弟，表姊妹, which still is four terms for different types of cousins, so it isn't exactly what I'm looking for.
So, how would you ask a question such as "how many cousins do you have?" in Chinese?