I'm 17 and my brother is 14 we are both applying for a non immigrant visa to USA as we're going on holiday in the summer and were denied ESTA having travelled to Iran. I was wondering what questions we would be asked in the interview due to being under 18 as most questions I've seen are about how much you earn etc. If anyone has any idea that would help, thanks
Minors will have to go with your parents/legal guardians or you will typically be denied the visas. Minors are asked simple questions like who are you going to visit, where will you be going, and who is financing your trip, which school you attend and what grade you are in. They will have questions for your parents and those are what will carry the most weight in whether you get visas or not.
I know this from experience with inviting my minor nephew to the USA some years ago.