Although "Kohakusaiki" (a recorded diary on the history of he Sengoku period supposedly written by Masatake Komai) has many articles about Yoshinobu (the heir of the Takeda family) and the second son Nobuchika (Ryuho), no information is found about his childhood including his menoto (a woman providing breast-feed to a highborn baby) and his guardian as there is no article about Katsuyori and Goryonin SUWA.
武田家嫡男の義信や次男信親（竜宝）に関する記事の多い『高白斎記』においても勝頼や諏訪御料人に関する記事は見られず、乳母や傅役など幼年期の事情は不明。