Your relatives will have a direct place in line in the family Green Card timeline with other applicants from the same country.
As soon as the USCIS approves your I-130 petition, the Department of State will invite your family to apply for an immigrant visa. If they meet all the requirements, they will be able to make a legal entry in the U.S. and, subsequently, adjust their permanent resident status.
It is worth noting that your family is not allowed to wait in the U.S. until they obtain permanent residence. Nevertheless, if they have already legally entered the country, they are free to apply to adjust their status. If you want your children to join you in the U.S. on a nonimmigrant status, you can apply for a Dependents Visa.
Since there are several documents required, the family Green Card processing time may depend on various factors. Thus, it is not possible to provide a timeframe, but your solicitor can show you the best way to monitor the progress of your application. Usually, you and your family will be notified when the USCIS receives your petition and when it has made its decision.
You can file a 1-130 petition if you are a U.S. permanent resident. If you eventually become a U.S. citizen, you need to inform the State Department’s National Visa Centre (NVC) immediately. When you become a U.S. citizen, your spouse and your children may have their visa immediately released.