The Daughters of the American Revolution (DAR) is a lineage-based membership service organization for women who are directly descended from a person involved in the United States’ struggle for independence. A non-profit group, they promote education and patriotism.
Any woman 18 years or older who can prove lineal, bloodline descent from an ancestor who aided in achieving American independence is eligible to join the DAR. She must provide documentation for each statement of birth, marriage and death, as well as of the Revolutionary War service of her Patriot ancestor.
There is a list of requirements that must be met prior to registration. You can find the these requirements here: Determining Eligibility.