In May 1939, Tada-jinja Shrine, located in Tadain, Kawanishi City, Hyogo Prefecture and enshrining MINAMOTO no Mitsunaka, established 'Seiwa-Genji Dozokukai' (Seiwa-Genji family council) to worship the deity and ancestors as the family of Seiwa-Genji, and for the development of industries and cultures in Japan, and mutual friendship among the family.
源満仲を祭神とする兵庫県川西市多田院にある多田神社では1939年5月、清和源氏一門として崇神崇祖、日本の産業と文化発展、一門の相互親和を図る目的で「清和源氏同族会」を設立した。