Only your spouse and unmarried children under the age of 21 can join you in getting a temporary green card during the conditional period of two years. 5 years after the Removal of Conditions when you have your permanent green card, you can apply for a passport. Once you are a citizen of the United States you can sponsor your parents to join you in the United States.
Only a spouse and unmarried child under 21 can be included in a Condition Green Card application. You could gift your parents sufficient funds to do a separate EB-5 on their own.
The principal investor can include only the spouse and unmarried children under age 21 as dependents based on the investment. Only a USC (U.S. citizen) age 21 or older may petition for a parent as an immediate relative via form I-130.