Tadamasa was the son of [[Mizuno Kiyotada]] (also known as [[Mizuno Nobumasa]]) and held [[Kariya castle]]. His daughter became [[Matsudaira Hirotada]]'s wife, which made Tadamasa a grandfather to [[Tokugawa Ieyasu]].
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Tadamasa was the son of [[Mizuno Kiyotada]] (also known as [[Mizuno Nobumasa]]) and held [[Kariaya Castle]]. His daughter became [[Matsudaira Hirotada]]'s wife, which made Tadamasa a grandfather to [[Tokugawa Ieyasu]].