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Today, I found out that the man I called grandpa for 40 years is really my dad. My drunk aunt spilled the beans. Her exact words were, "My dad is a better dad to you than he EVER was to me! You never wondered why he treated you better than his other grandchildren? You're his son!" FML
Woah that's heavy!! So your 'grandpa' clearly fucked your mum, but where' & who is your 'dad'?
I hope your "grandpa" is your dad's dad, not your mom's dad. That would make it slightly less appalling.