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The chance of the child having schizophrenia when both parents have schizophrenia is about 37%. There is no data available for other combinations of illnesses, for example if one parent has schizoaffective disorder and the other has schizophrenia.

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Q: What is the probability of having a child with schizophrenia if both parents' mothers had similar mental illness?
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What percentage of children whose parents both have schizophrenia become affected?

36 percent of people with two schizophrenic parents develop schizophrenia.


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