At the time of the Hogen War in 1156, her adopted father, Yorinaga was killed, but it didn't affect her; the Tokudaiji family had already disaffiliated itself from the Yorinaga forces; her grandfather, Saneyoshi had become togu-no-fu (an official in charge of education of the Crown Prince) of Prince/Imperial Prince Morihito (future Emperor Nijo); FUJIWARA no Yoshiko, Masaruko's elder sister entered into the inner palace of the Emperor Goshirakawa.
保元元年（1156年）の保元の乱では養父・頼長が戦死するが、徳大寺家は、祖父・実能が皇太子・守仁親王（後の二条天皇）の東宮傅（とうぐうのふ）となり、多子の姉・藤原忻子（よしこ）が後白河天皇の後宮に入るなど、すでに頼長派から離脱していたため打撃は受けなかった。