Yes, individuals can generally add family members to their Delta Dental Illinois plan, contingent upon the specific type of plan they hold. Most family plans typically allow policyholders to include their spouse, children, or other dependents. The enrollment process usually involves contacting the insurance administrator or using the online member portal, where one may be able to manage their policy details. It is important to note that there may be specific eligibility criteria or restrictions pertaining to the age of dependents or the timing of the addition. Checking the Delta Dental Illinois website can provide detailed guidance related to the procedures and requirements for adding family members, as well as any potential impact on premiums or coverage limits. For accurate and comprehensive information, policyholders should refer to their specific plan documents or member resources.