How to get a green card in America? Can I apply at any immigration office in the United States?

To apply for a green card, you need a regular employer to help you apply. If you have a fixed employer, you need to have a fixed residence, so you should inform the immigration bureau in time every time you change your address. It doesn't matter where you get off the plane. Your address is still the same. It can be said that you are at home. Generally speaking, applying for a green card is handed over to a processing center, and they will issue it. Regarding the scheduling, I don't know why your parents didn't apply for you together when they applied. The age is calculated from the time of application. If it was handed in at that time, it may not be 2 1 year old, so it will not be overdue. The schedule was approved by I- 140, with priority dates on it. Then submit I-485, just write down the whole family and use the same schedule.