Which of the following is designed to insure a low-income person and family?

CHAMPVA (Civilian Health and Medical Program of the Department of Veterans Affairs) is a health care program for spouses and children of disabled veterans. It does not specifically target low-income individuals or families but rather serves a specific group related to military service, thus not fulfilling the requirement of being designed for low-income persons.

Medicare is a federal health insurance program primarily for people aged 65 and older, as well as certain younger individuals with disabilities. It is not geared towards low-income families; instead, it is based on age and specific health conditions, making it unsuitable for the question posed.

Social Security is a federal program that provides income support to retired workers, disabled individuals, and survivors of deceased workers. While it assists with financial needs, it is not specifically a health insurance program designed for low-income persons and families.

Tricare is a health care program for military personnel, retirees, and their dependents. Similar to CHAMPVA, it does not focus on insuring low-income individuals or families in general and is instead limited to those connected to military service.