I agree with Mudhound. If a child is bipolar then they are bipolar and it doesn't matter how many parents or extended family are there or not.
The doctors are the best ones to evaluate the child's behavior altho input is good.
My concern is why the mother seems to be seeking out
a diagnosis of bipolar disorder. It sounds like 3 doctors called it something else before the 4th said Bipolar?
Are you aware if there is Bipolar Disorder in the family history of the mom or dad that would lead her to zero in on that diagnosis?
It seems a little odd is all...