May be just what you need for your family association / surname DNA project:
“GigaTribe has been launched in the U.S. market. A free software community, GigaTribe lets you share entire file folders of photos, videos, music, and other files with your "tribe" of friends, family, and coworkers in a private, encrypted peer to peer environment.
Sharing large files or sensitive documents with friends, clients, and coworkers shouldn't be as hard or as expensive as it is with other services, which can charge up to thousands of dollars a year. GigaTribe is entirely free, with the option of a GigaTribe "Ultimate" upgrade with more advanced features (such as faster downloads), priced at only $29.95/year. In addition, GigaTribe does not require any extra steps to share a file. Once you select which folders you want to share with your groups, those folders are instantly accessible to your friends. You can add new files to those folders or change those files at any time. There is no need for any additional steps, no uploading, no size limitations, and no security threat.”