It is said that since Tukiyama-dono, Tokuhime's mother-in-law, was worried that Tokuhime did not give birth to a legitimate child for a long time after marriage, she made Nobuyasu marry a female servant who was a daughter of an ex-vassal of the Takeda clan Masatoki ASAHARA, which led to discord between Tukiyama-dono and Tokuhime.
しかし、いつまでも嫡子が生まれぬのを心配した姑の築山殿が､信康に元武田氏家臣の浅原昌時の娘で、部屋子をしていた女性を側室に迎えさせたため、この時から築山殿と徳姫が不和になったといわれている。