Children of schizophrenics

[serraduchi]

In my latest attempt at a novel, the main male character's mother suffered from schizophrenia to the extent that she hung herself while said character, at five years old, watched. Obviously this experience in and of itself has caused some residual effects, but my real questions are as follows:

-With a severely schizophrenic mother and a presumably normal father, what are the chances that the child would eventually suffer from schizophrenia?
-In such a case, is it possible that the child would have some mildly psychotic symptoms, but not be affected enough to warrant a diagnosis of schizophrenia?