Perhaps you know, what is the possibility of a child developing sz with both grandmothers suffering from sz, but both parents are unaffected? Is it 50%, 10% or how much exactly?
And in a brief nutshell what are the most dangerous indications in childhood?
There are a number of issues that affect the 'odds' of a child developing schizophrenia. One of these is the age at which the parents have the child. The children of older parents are generally thought to have an increased risk.
Figures can vary but it's safe to say that around 90 percent of children with a schizophrenic parent will never develop schizophrenia themselves. If both parents are schizophrenic then the risk does increase to around 30/40 percent. In your scenario, with both parent's being unaffected, even with grandparent's affected, the odds are dramatically reduced. Have a look at this chart from Schizophrenia.com
I'm not quite sure what you mean by 'dangerous indications' but I guess this means symptoms? Dr. Paul Ballas has written an article on the signs of schizophrenia in children.
I don't know what the percentage would be but I do know that worrying about it will not do any good and it could do some harm as fear seems to be one of the causes if not a root cause of sz. Environmental factors such as having a good diet and avoiding contaminants could be more of a serious consideration for prevention.
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Thank you for your reply; most helpful and reassuring.