Since Oikawa has a nephew (whose family name is also Oikawa), he most likely has an older brother. Though, there's been recent strips of Furudate hinting he has an older sister instead.
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Since Oikawa has a nephew (whose family name is also Oikawa), he most likely has an older brother. Though, there's been recent strips of Furudate hinting he has an older sister instead.
