My brother immigrated to America.

First of all, is it your own brother? If so, the current progress is 1 1 year.

Secondly, what do your parents do? Suppose parents are green cards, which are divided into two categories: whether they are below 2 1, below 2 1 for three years, and above 2 1 for eight years.

Suppose it's your own brother. If your parents don't have American status, apply for 1-2 years, and then apply for you. Time depends on it.