B1/B2 Visa interview. Any suggestions on what questions will be asked for parents of H1B?

My husband parents have an interview next week and lot of people are telling different things about interview. Like kind of questions they will ask and the scrutiny.

My in-laws both working but have never travelled out of India and are a nervous about the interview.

Any suggestions on what to expect and types of questions they will ask? Thank you!

Their interview is in Hyderabad.