AITA for being the reason my grandparents refuse to help my dad anymore and laughing when he and his wife complained about it?

A 16-year-old boy discovered his father planned to take the inheritance left by his late mother to fund an expensive treatment for his half-sister, despite it being specifically allocated for the boy’s future. When the boy refused, his father insisted on using the money anyway, calling him selfish for prioritizing college.

The boy told his grandparents—his late mom’s parents—about the situation, leading them to cut off all support to the father. Now angry, the father confronted the boy, only to be met with laughter and the reminder that the boy warned him he would never forgive the betrayal. Read the original story below…

‘ AITA for being the reason my grandparents refuse to help my dad anymore and laughing when he and his wife complained about it?’

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This story highlights complex family dynamics, the importance of boundaries, and difficult choices involving money and relationships. Was the son justified in involving his grandparents, or should he have handled it differently?