There is not much really you can do to speed up this process.If you already filed then its just a waiting game . Unless there is some specific circumstances that would allow the process to be shortened you really got to wait.Most people do it the other way though. They
apply for those once their loved ones are already here on tourist visas.
That allows them to at least vist here first.But your best bet is to contact an immigration attorney !Good luck!
Oh by the way you did not mention the age of your wifes sis.This make a diferrence too !
Citizens of the United States of America who are resident in the United States of America must file petitions for immigrant visas in the United States of America with such government agencies as the Department of Homeland Security (which is abbreviated as the DHS), the United States Citizenship and Immigration Services (which is abbreviated as USCIS) office which falls under the jurisdiction of their place of residence.
All petitions for immigrant visas for relatives such as the parents, siblings and children who are over 21 years of age must be filed with the DHS in the United States of America. Citizens of the United States of America who are resident in Colombia may file petitions on behalf of such relatives as their spouses, children who are below the age of 21 and unmarried and stepchildren. It is necessary to attach Form I-864, Affidavit of Support, along with Immigration Form I-130, Petition for Alien Relative.