In 1585, Michitomo went back to his hometown as Ieyasu was officially called to Kyoto, and he was given the family name Horikawa and allowed to found a new family upon the recommendation of Ieyasu.
天正13年（1585年）、家康が上洛した際に親具もこれに従って帰京したが、この時家康の計らいで親具に堀河の家号が与えられて新家創設が許された。