Hello! My family (my parents, myself, and my little sister) came to the US from Vietnam over 20 years ago. My parents and I became naturalized US citizen about 15 years ago, and my sister automatically became a US citizen as well since she was a minor at that time. I am starting to fill out the e-QIP for Secret clearance and wondering how I should answer the dual citizenship question (for me and for my family members). Did we automatically forfeit the Vietnamese citizenship when became naturalized US citizens?
None of us currently has any Vietnamese passport. We all have US passport.
Thanks for the input!