With my sister and narcissist and my brother a felon, what kind of mistakes might or mom have made to make them this way?

Question

My brother got his act together but my sister is still a toxic person to know and very mean-spirited. 

Update:

Sorry I was talking into my audio recorder, I’ll type it and try to ask again sorry for the grammar errors it didn’t come out right.  

Answer 1

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Again, in English