How do relatives apply for a green card in the United States?

It's not complicated, but it takes a long time.

First, your aunt must be an American citizen.

Then, your aunt applied for your father's immigration.

According to what you said, you should be over age and can't be with your father.

Your father's schedule is about 10 years.

It will be five years before your father can be naturalized in the United States after he arrives in the United States.

I'll apply to you then.

Adult children of American citizens will be arranged for about 7-8 years.

In this way, it will take about 25-30 years to get to the United States.

Moreover, if you get married during this period, the schedule will be longer.