Can you also say 'Is he your first or second son?'
Thanks, then I'll report it next time!
How do you deal with the ambiguity? Assume someone has a son, then daughter, then son. If you're addressing child #3 and ask "Is this your first or second son"? The answer is "yes". If you ask "Is this your first or second child"? the answer is "no"
It's ok: Is he your first son or the second one?