Should I proved and tell my fake siser that in reality she's adopted to get my revenged?

My sister is a horrible person. After the way she treated my mother and I poorly she also denied us having a close relationship with my nephews.

I was thinking and planning last night to hurt her back and confess to my sisternthat in reality she is adopted.

About 30 years ago One of my cousin's who past away in the hospital due to a car crash in 1993 she was 17 at the time past away se wuldbhad been 47 now if she was still alive. My cousin left her boyfriend took all parental rights away from her ex boyfriend and took my sister away. She asked y step-dad if he could please adopted my selfish sister. My sister would always tells us she would have this dreams about a young guy with black hair super light skin tone holding her. My mother andbI know thats her bio father. I was 8 years old. Before my sister my poor mother suffera miscarriage it was a baby boy I remember how happy and excited my mother was. My mother's due date was Steptember 28 ,1991 my mother slipped in the staircase and suffer lost the baby. My mother got into a very deep depression. I was only 9 at he time my mother and stepfather arrived home with my sister. I was confused at the time until my mother explained the situation to me. Yes my sister is adopted but she doesn't know. Out of reveged I want to tell her after the hell she's put my mother in. My mother had been an amazing mom to my sister. And my sister never appreciated my mother.

My mother knows that young men taht my sister hadndreams about is her biological father. My cousin past away and she begged my step father to please look after her she didn't have much time left.

After all these 30 years I want to tell her to get my revenge teach my sister a lesson. Mypoor mother suffer enough not once thank my mother.

No one messes with my mother9n this earth no ONE!

Should I proved and tell my fake siser that in reality she's adopted to get my revenged?
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