Unrealistic and Improbable
It seems to me the suicidal sister pretty much gets ignored here. Dr. Lowenstein was more into helping Tom than Savannah. Also, it is highly improbable from a legal standpoint that a psychiatrist would interview family members of a patient unless they have consent from the patient. In fact, it's illegal to do this. And seeing that Savannah was doped up and tied down I don't think she consented.
Also, would any psychiatrist really hire one of her patients to teach her son football? LOL. That was a joke. And then the husband invites him to a dinner party? Ha. Maybe these things happen in New York, but not around here. Doctors are usually pretty professional and they don't "hang out" with patients after work and make them surrogate fathers to their kids. LOL.
Where was poor Savannah while Dr. Lowenstein was wining and dining it up with her brother? Tied down in the psych ward? Nice.
The whole movie is pretty improbable, really. It seemed Savannah was the one in real trouble here and she is hardly mentioned. The movie is warm and touching at times, but all the, "yeah rights" keep it from really being a good picture.