Why is there no gender-neutral singular or plural term for "aunts and uncles" and "nieces and nephews?"
If you want to refer to someone's mom or their dad, without specifying one or the other, you say "parent." If you want to refer collectively to a mom and a dad or to a group consisting of some moms and some dads, you say "parents."
Grandma/Grandpa = Grandparent(s)
Sister/brother = sibling(s)
Son/daughter = child(ren)
Grandson/granddaughter = grandchild(ren)
Husband/wife = spouse(s)
But there is no gender-neutral word to describe aunts and uncles and nieces and nephews. So, if you're spending the holidays with various family members, and you're describing who will be there, you would have to say "I'll be spending time with my grandparents, my siblings, my children, my parents, my aunts and my uncles, and my nieces and my nephews," because there's no word to describe that relationship that doesn't specify gender. Why not? This has always puzzled me.
Also, why does the word "cousin" have the opposite problem? Every other familial relationship has one word for if that relative is a female and another for if the relative is a male, but "cousin" is purely gender neutral.
And yes, I'm aware that these are weird things to wonder about, but I wonder anyway...