Can I Sponsor My Parents And Siblings For A Green Card?
Once you've had your Green Card for five years, or three years if it is marriage based, you can petition for citizenship. Once you become a citizen you can petition for your parents to come to the USA right away. Your can petition for your siblings, but they will be put on a wait list. You can see the how long the wait is here:
You can not petition for your parents and siblings while you are a Green Card Holder; you have to become a citizen to do that.