How to ask about ordinal place of an offspring? [duplicate]

There isn't a simple way of asking this in English, which may partly explain why people don't often employ that specific question.

I sometimes start by asking 'Do you have any siblings?' And if they say something like, 'I have two brothers and a sister', but don't tell me which are older and which are younger and, if I am still interested in finding out, I might say something like 'Are they older or younger than you?'. By now I would expect that they would have clarified where they are in the family.

It sounds complex, but to begin by asking 'Which numbered child are you in your family'is not only awkward linguistically, but perhaps too direct and a bit rude as an opening question.

I would be interested to know if you are Asian, as is my wife. Among the Chinese, for example, this question of where a person sits in the family hierarchy is more important than it is in Europe or America. Younger siblings use honorific titles for their older brothers and sisters, a bit like auntie and uncle, only different words to that.

The statement below can be addressed as "formal".

What birth order are you?

This question has been used in psychology "check in sheets" when obtaining client information.

You also have some non-formal ones which are:

Which one are you among your brothers and sisters? Which one are you among your siblings?

You can also say "Are you the youngest in your family", to which you would reply. Yes, no, and then provide the appropriate information addressing your nth position.

You could derive their position by asking

How many older siblings do you have?

And then just adding 1 to the result.

Edit:: Following the similar question link, one could follow a similar answer with

Your oldest sibling is the first child. Which child are you?