Kiyonaga MISAWA, a son of Tamemoto, was treated as a senior vassal because his daughter Hatsuko became a concubine of Tsunamune DATE, the head of the Date Domain, who had no legal wife (Hatsuko was the real mother of Tsunamura DATE).
為基の息子三沢清長は娘・初子が藩主伊達綱宗の側室（伊達綱村生母・綱宗には正室はいなかった）となった事から重臣の待遇を受けた。