translation - Shortest question to ask when you want to know whether the one you talk to is the eldest, second, third...or youngest child in his/her family.

I’ve always been asked by my Filipino friends how I should say the Filipino question “Pang-ilan ka sa magkakapatid?” in English.

You ask that question when you want to know whether someone is the eldest, second, third...or youngest child in the family. What’s the shortest way to ask such question without necessarily mentioning choices (eldest, second, etc.) as the Filipino question also does not mention the choices?