Your grandmother and grandfather are your grandparents. Your son and daughter are your children. Your brother and sister are your siblings. But when it comes to uncles and aunts, English gives us no genderless term that includes both.
The closest we’ve got, is an ugly, hatchet-faced word, made by collapsing “parent’s sibling” into… (Wait for it…)
“Pibling.”
Quite frankly, “pibling” sucks. But I’ve got an idea…