You must be a US citizen age 21 or over to file for them. You file an I-130 for each of them. Mom and dad's together and sister is seperate. Parents are immediate relatives and get a visa faster. Sister is 4th preference and will take a decade to get a visa. Start with that, it will take a few months just for the I-130's to be processed for parents. The sister's petition may just get stuck on a shelf and ignored for a bit longer.
Come back with more information if you have further questions.
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