I'm not sure which specific 'Psycho Brother - in - Law' true story you're referring to. There could be many stories that might fit this title. It could be about a difficult or dangerous relationship with a brother - in - law who has some psychological issues.
One possible plot could be that the brother - in - law is secretly stealing from the family to support his gambling habit. Another could be that he spreads false rumors about the main character in the family to create chaos.
One possible plot could be that the brother - in - law is financially exploitative. He might be borrowing money from the family without any intention of paying it back, causing financial strain.
I haven't heard the exact 'Psycho Brother - in - Law Real Story'. However, generally, a story like this might involve issues such as a controlling or abusive brother - in - law. It could be that he is overly interfering in the family's affairs, causing stress and unhappiness among the family members. Or perhaps there are more complex psychological issues at play, like jealousy or possessiveness.
Psycho is purely fictional. It was crafted to provide a thrilling and suspenseful narrative rather than being drawn from real events. The characters and plot are products of imagination.