Hello everyone
Thanks for sharing your knowledge with me already. My concern is that I was 14 when my dad applied for his citizenship, somehow, when we received some paper they gave me the same age as my brother. So it ended up taking more time story to get our age fixed. My dad recently took his oath, and he also told me and my siblings that we are citizens too. What I would like to know is that now I am 20, does that mean I can still be a citizen under him as the process started when I was 14 or 15? He told us that we had to go to the court to get our American passport

You and your brother have to file form N-600 to get Certificate of Naturalization. After you have this document, then you can apply for US passport.

I was under 18, plus the reason why it took him longer was because of the mistake they make on our paper.. that is why I am thinking that I am too.