In Ring 2 Ryuji's death, and then Reiko's, leads Yoichi's powers to become more sinister and like Sadako's.
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In the Korean film adaptation, The Ring Virus, Hong Booram, is the daughter of single-mother Sun-Joo Hong.
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He also appears in the "official" sequel to the Ring Trilogy, named Ring 2.
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He clearly loves both his parents, as demonstrated in Ring 2, but his relationship to both of them is also on a supernatural level.
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Yoichi is badly affected by her death in Ring 2, seeing as how his father Ryuji had already died, Reiko was all he had left.