Can a child get bipolar disorder by having two psychologically different parents?

Not usually: Having very different parents by itself is not a risk factor and can even be considered positive.However its all in the delivery. The match between the parental personalities and yours is crucial. Its long been argued that giving mixed messages, putting children in binds of allsorts and a nnegative environment can contribute. Great questions to explore in therapy.

The numbers are: 35% or so a child will have it if one parent has it 75% if chance child will have it both parents have it. As far as a parent having it: this is done by history taking and interview observation plus the psychiatrist needs to get some information from those who are around the adult often e.g. a family member for example aka Only a psych eval can produce a diagnosis, no clinical blood test yet.