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Going with the assumption these boys are not twins, it is very plausible that Charles got sent to live with his biological father after being blamed for Ali’s injury. Mrs D had an affair with Bethany Young’s father, and I believe this is who Charles’ biological father is, and how Bethany is of any relevance. We know Wren’s father suffered metal health issues, and we know Bethany Young was a Radley patient; could this connect the two? MHI can be hereditary after all.