B2 visa for parents and 17 year old brothersponsored by my husband

[gauri2206]

My parents are brother are going to give an interview I am able to find expected questions to my parents but I could not find it in any post what are the expected questions to be asked to my brother? Is it ok that I am sending all three of them together for the interview? Any help is appreciated

[immihelp]

It is OK for all of them to attend the interview together.

[gauri2206]

It is OK for all of them to attend the interview together.

I wanted to know the questions or any specific instructions for my brother being just 17 he I need to tell him the probable questions that he need to answer.