Don't bring your parents to the interview lol.
Seriously though, you're interviewing the company as much as they are interviewing you. Find interview questions examples to ask during the interview. You'll want to find out if you like the work culture, if it looks like the interviewers like their job, how frequent overtime is required, etc.
Whether they give you a job offer or not, don't sweat it. There is a lot going on at the company outside of your control that will affect them giving a job offer or not regardless of how well you did in the interview. I recommend taking the interview as a learning experience and practice with a friend beforehand. Doing well in interviews is a skill especially for technical interviews where folks can ask a range of questions while all eyes are on you.
Good luck!
Don't have kids...