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The basic question is whether if my wife obtains citizenship in the U.S., will she retain her Thai citizenship?

This has likely been asked a thousand times but I don't know how to search for it. And please, only responses from someone who KNOWS, not mere guesses or personal comments.

Thank you.

The answer is yes. My wife became a US citizen and is still a Thai citizen. She even renewed her Thai passport in the US since becoming a US citizen. All three of my children are both US citizens and Thai citizens as well. They have US and Thai birth certificates as well as US and Thai passports.