What notarization is needed for parents and younger brothers to apply for immigration to the United States? Which application form?

Stay? It doesn't matter. I just need to go through some formalities, but I still need to find a lawyer to help you. Only a lawyer can help you. It's no use asking yourself.

If you are a citizen, you need to pay higher income tax to apply for your parents and younger brother to come to the United States, and it is easier to succeed. And it will take a long time, so don't worry, because you can't hurry. Find any lawyer. You don't need to be famous. He will represent you and tell you how to fill out the form and how much tax is enough.

I have a friend's daughter, just like your brother. She married a foreigner and got a green card, and then applied for identity for her daughter who came to the United States as a tourist and stayed in the United States for many years. Although staying overnight is illegal and the passport is black, it is not a very serious matter. So don't worry too much.