Hello Tacomaman,
It will certainly be a very informative book. I just did a little research to learn about Mary Trump. She is the daughter of DT's dead brother Fred, who rejected the ruthless family trait, did not want to run his father's business, and eventually died of alcoholism. She is a clinical psychologist. She has quite a story to tell.
There is a lot of bad blood in the Trump family. There have been lawsuits about inheritances. DT's father had Alzheimer's in the end. Mary claims that DT coerced his father, suffering from dementia, to cut her and her brother out of the will. DT stopped funding the medical treatments for the 18 month old son of Mary's brother, who had epilepsy. Mary then released some of DT's taxes to the NYT, and a Pulitzer winning 2018 article was written charging DT with fraud.
Mary also claims that DT failed to help save his brother Fred as he suffered from alcoholism.