since go ahead, I have a big problem with "the mother". for me, she's so bad and despicable that sometimes I can't watch her scenes (the actress are good, tho) because make me feel so angry about she treats her son. that's not okay. what do you guys think? 

Both, imo, but mostly evil. I see her as extremely narcissistic, and taking out any guilt she feels over her daughter's death on her son instead of allowing herself to consider her role in it and the fact that he was just a kid. 

Both for sure! This character talks about struggling with depression when her children with her first husband were young and clearly has some sort of mental disorder like Borderline Personality Disorder. Mental illness does not excuse abuse, however, hence why she is also evil. Her cruelty, manipulation, and mind games were absolutely a choice and she knew full well the harm she would cause her son. That was the point. The actor that portrays that character is phenomenal—to the point I could see her getting hate mail, because she channels that twisted character so well.