You can bring your dad + step mom. The process will take about 10-16 months and is not extremely difficult (unless they have issues, such as crimes or previous deportation.other issues might complicate matters). First you file the family petition. Once approved, the USCIS will transfer the file to the National Visa Center to start the consular processing. You can start the consular processing for both of them as soon as you get the "Fee Bill". For your step sister, things are a little more sad and will take longer. You first file the family petition, as you did for your mom and dd. You can do so at the same time. Once the petition is approved, the USCIS will also forward the file to the National Visa Center (NVC). The NVC will keep the file until a visa is available. The current estimated waiting time for a visa (through a American sibling, beneficiary from Spain) is about 11 years. Some other ideas to get your step sister a little faster: Your parents should request humanitarian parole for her (a somewhat complicated process / paperwork but it would allow your step sister to be "Paroled" into the US because she is too little to be by herself. As soon as your step mom or dad arrives in the US, they could file for her a family petition. This process takes about 4 years. Better get an attorney to avoid pitfalls for your little step sister. Not so simple here. Good luck.
Answered on Apr 13th, 2011 at 11:23 AM