Also, the gameboards are written by Yasu or Tohya. They do not show the truth of prime.
While the Ushiromiya family might not have the closest bonds of all... they wouldn't agree so easily in helping Yasu when bribed like in Our Confessions. It is a fictional story, so the author may take some liberties. As AuraTwilight said only Nanjo is shown to have been bribed. So, even when being offered money, most of them would hesitate and probably even refuse helping Yasu.
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