Theresa E. Tilton, Attorney at Law | Theresa E. Tilton
Your US resident father can petition for his children's legal residence. The sooner he does this, the better. There is a waiting list for the permanent residence visas. The wait is a shorter time for children under age twenty-one. If, by "siblings", you refer to people who are not your father's children, the result would be different. If you are an adult, you can petition for your siblings. This category has the longest wait period.
Answer Applies to: Washington