However, the lineage went into decline when Yukitsuna TADA, who belonged to the clan's lineage of the eldest son, was shunned and deprived of the real estate in Tada during the Jisho-Juei War by MINAMOTO no Yoritomo, and thereafter the historical materials making mention of what happened to the clan became fragmentary (see the article of "Tada-Genji").
が、治承・寿永の乱に嫡流であった多田行綱が源頼朝に疎まれ多田荘の所領を没収されると衰退し、以後一族の動向を伝える史料は断片的なものとなっている（多田源氏の項目も参照）。