Website: http://www.nationalsocietydfpa.com
Eligibility in the Society requires an unbroken paternal line of either the applicant’s father or mother, going back to a Founder who arrived in one of the Colonies between May 13, 1607 and May 13, 1687, and in this unbroken line, an intermediate Patriot ancestor who, by personal service in a civil or military capacity or by other acts proving his unfailing loyalty, assisted in establishing American independence during the Revolutionary Period, 1775 to 1784.
Source(s): http://www.nationalsocietydfpa.com/membership.html