Our expert says:
In Bipolar Disorder in one or both of one's genetic parents, one can inherit a degree of vulnerability to developing a similar illness onesefl. I have seen no good evidence that this would apply to a step-parent's influence, and the children are old enough to be less vulnerable, anyway. Simiarly, children are generally less affected by divorce than by living in a chronically unhappy family. And as one assumes that your wife's potential new partner would be sensible enough to be under good treatment for his bipolar disorder, the impact should be minimal.
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