Random Observation #6

I was teaching a new student about family relationships, and really struggled with something. We have collective terms for family members:

Your mum and dad are your 'parents' and you are their 'children'.
Your brothers and sisters are your 'siblings'.
There are 'grandparents' and 'grandchildren'. There are even 'cousins'.
Yet you just have an aunt and uncle.

There seems like there should be a collective term for aunt and uncle. There is in other languages. hmm?