This reminds me of how I miss the word "siblings" in Ukrainian. There is no word for that, unfortunately.
Well, it's as good as if there were no such word... If I used it, no one would understand what I mean. They might also ask what region I am from.
We don't have the word for "siblings" in my native language either. Do I miss it? No way,that's what CONTEXT is for
So if you want to ask someone, "Do you have any siblings?", would you just use брати (similar to батьки), or would you have to say брати або сестри?
You would say "У вас є брати чи сестри?" ("брати або сестри" means that you know that they have a couple of siblings, but you just not sure of their gender)