The Mystery Files of Detective Inaba No. 2

Detective Sogo Inaba received a request to take on an extramarital affair case from a woman named Nadeshiko Sakaki where he was called over to her residence. Upon arrival, Sogo learned that the patriarch of the Sakaki household had committed suicide not long before his arrival. Now that the complex question of the family's inheritance has come to light, Sogo must struggle to get to the bottom of it. What conclusion will Sogo come up with at the end?