Why is Tsukiichiro called Hiroji's mother?

Because the soul in the doll in the play is Hao Ji. Howie is the mother of Ichiro Tsuchimikado (Dr. Lin, who appeared in The Red Moon, is actually a Japanese evil practitioner). Ichiro Tsuzuka called Hao Ji his mother because the soul in the Hanako doll in the play was Hao Ji, and Hao Ji went through many hardships and designed many traps in order to resurrect her adoptive father Toyotomi Hideyoshi. In fact, she herself died many years ago. It was his adopted son, Koichiro Tsunami, who tried his best to bring her back to life. However, her body is no longer available, and she can only temporarily put her soul into Hanako doll. The first thing she did after her resurrection was to revive her adoptive father, Toyotomi Hideyoshi.