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: https://travel.state.gov/content/visas/en/law-and-policy/bulletin.html

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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.