To naturalize (or become a US citizen), one has to become a lawful permanent resident first.

A person who enters the USA as refugee is required to apply for adjustment of status (Green Card) one (1) year after admission. Some people fail to do so. If not applied, you will not become a green card holder automatically.

Do you have a Green Card? What is your status/ It's not clear from your post.

If you’d like to schedule a telephone legal consultation, please let me know: Attorney [@] law-visa-usa.com

Note: The above response is provided for legal information purposes only and should not be considered as legal advice. This response doesn’t create an attorney-client relationship, which can only be established through payment of a fee. If follow-up advice or consultation on your specific situation is requested, we offer a paid consultation by telephone or email. Please visit our website http://www.law-visa-usa.com/contact_us.html for more details. Our contact email address is Attorney [@] law-visa-USA.com

Let's get you moving. Somehow you have gotten by with no status at this point, but possibly one pending. You don't know. To find out, you talk with a good immigration lawyer, lay out the facts. I don't believe your case is difficult to resolve -- but something needs to be done or accidentally you and your siblings an end up in a procedural nightmare. Not fun. If you need help, you can check us out on www.seglegal.com. But get help as quickly as you can. The best of luck to you. Take care.