Asuming this is some kind of investigation.

• <Personal question>?
• Sorry, I don't talk about my personal life at work.
• Why?...
• It makes me uncomfortable.
• why? (Again! )
• It's unprofessional and makes me uncomfortable.

Now if they keep anoying you could go to more "profesional" answers that will cut the interview right there: - It's illegal (depends on your country's laws). - Asking 4 times the same question shows you don't trust my answers which defeat the porpouse of an interview. - I'm not here to be interrogated/harassed. After stating one of those you should bring up your time working there and show your discontent.

• I've been working here for 18 months and done my job, this is no way to treat a good worker. (you can leave after that, just remember to contact HR a statement with your discontent, you can still contact HR if this was a job hiring interview, and don't worry; if they allow to harras employees before hiring them, it means you don't want to work there).

This is valid for anytime someone ask the same question more than 3 times, and depending on context only 2 times.

This was taught to me by an Enterprise Psicology professional. If they don't trust or respect your answers, then there is no reason for you to be there.