I realize that this documentary can't cover everything, but there's a backstory to the "childhood bipolar" diagnosis that people should be aware of. Before the early aughts, virtually everyone in the psychiatric establishment believed that you couldn't diagnose BP until the person was an adult, or at least in later teens. Then one Dr. Joseph Biederman suddenly started making the rounds telling everyone that childhood BP was a real thing. Kids started being diagnosed at 2, 3, 4 years old. There was a veritable explosion of BP diagnoses among kids.
So what changed? Well nothing changed about the kids. Biederman had massaged the data and created a dubious diagnostic tool to promote not only the diagnosis, but the use of a particular antipsychotic medication in these kids. Later it was discovered that he was receiving millions in undisclosed kickbacks from the drug manufacturer. People started questioning this wave of BP diagnoses among kids, and a lot of practitioners have returned to believing that this is not a diagnosis to be made among children. I won't argue that it doesn't exist at all, but I think there are good reasons to be skeptical of how often it's diagnosed in light of the history -- which was entirely profit-driven rather than based on any real advancement in science.
This is what really stood out to me when the grandmother was told that all four kids had BP. This is so unlikely as to be almost certainly untrue. It is the height of psychiatric hubris and laziness. And it reminds me, as someone else pointed out, about how much psychiatry can resemble new age spirituality more than it does science (or medicine).
Now, is that to say that there's nothing wrong with these children at all, or that they all would get better if taken off of the drugs. It could very well be that the drugs "work," although with an antipsychotic a big part of it is always going to be sheer sedation. But the sloppy overdiagnosis of BP, especially among kids, is worrisome. Particularly considering how parents like to watch a documentary and then start wondering if their child has it too... after all, it would explain all those temper tantrums, right?....