http://travel.state.gov/content/visas/en/immigrate/Immigrant-Investor-Visas.html contains much information for you, such as:
Can My Family Members also Receive Immigrant Visas?
Based on your approved petition, your spouse and minor unmarried children, younger than 21, may apply for immigrant visas with you. Like you, they must also fill out required application forms, obtain required civil documents, pay the required fees, and undergo medical examinations. Same-sex spouses of U.S. citizens and Lawful Permanent Residents (LPRs), along with their minor children, are now eligible for the same immigration benefits as opposite-sex spouses. Consular officers at U.S. Embassies and Consulates will adjudicate their immigrant visa applications upon receipt of an approved I-130 or I-140 petition from USCIS. For further information, please see our FAQ’s.