At that time Tadaharu's paternal aunt (Yoshiharu's oldest daughter whose name was unknown) and Horio, Kawachi no kami (the Governor of Kawachi Province, a son of Yoshiharu's daughter) who was a member of the family and the hitto karo (the head of chief retainers) attempted to embezzle the headship of the family from Tadaharu, but the plot was revealed then the Kawachi no kami and the kamori (Housekeeping, his father) were exiled and ordered seppuku (suicide by disembowelment).
このとき伯母（吉晴の長女、名前は不明）と一族で筆頭家老の堀尾河内守（吉晴の娘の子）親子による家督横領の陰謀が発覚し、河内守と掃部の父子は流罪のうえ切腹を申し付けられている。