In April, 1587, Sadakatsu's father Toshikatsu died in Okazaki-jo Castle in Mikawa Province (aged 62, his posthumous Buddhist name was Yokoinden) and was buried in Anraku-ji Temple in Mikawa Province.
天正15年（1587年）3月、父・俊勝が三河国岡崎城で逝去し（享年62、法号は陽光院殿）、三河国安楽寺に葬る。