Is this person evil or could it be a mental condition?

The person in question appears to be surrounded by death and generally has a dislike for anybody progressing in life. She takes great pleasure in other peoples woes and will go out of her way to make life miserable for those she ought to love, especially men. Irrespective the relationship, showing open hatred for the son to a point of disinherting him while showing open preference (I am not sure she is capable of loving) for the daughter with whom they have a strange bond. The daugher being a replica of the mother by way of character. She has another severly autistic son who has been neglected for the last 38 years. Husband ped on with a son in a traffic accident barely ten years into the marriage. When she got involved with the inlaws, there have been many early deaths and calamities where members of her husbands family have turned to alcoholism. Same appears to have happened to her own family where despite her great wealth wanted to inherit the lions share, the drama coming to an end only when her mother ped on since she had a hypnotic hold over her. Some of her brothers and sisters are not well off. There is rumour that she is involved in the occult.