Hi my name is Priscilla I want to know if I can file for my brother and sister.

Yes you can sponsor your brother and sister, but it's going to take probably 10 years or more before they can qualify to apply for a green card. Siblings fall into the F4 category, and in order to determine the time that they will have to wait, you can google the "department of state visa bulletin board" and it will tell you under that category what priority date that US CIS is currently working on.