 Membership in the Belnap Family Organization is automatic for all descendants of Gilbert Belnap, who now number over 10,000 and are found in most states and several countries outside the U.S.Membership is also available to other persons surnamed Belnap or Belknap or who descend from such persons.One of the larger and older Mormon family organizations in continuous existence for more than a century, the Belnap Family Organization, a 501(c)(3) association since 1974 organized under the laws of Utah, serves as an umbrella organization through its 15 constituent branches (one for each of Gilbert Belnap's children who lived to adulthood) for sub-organizations at the grandparent and parent levels.