مقبل على الزواج من ابنة خالي و نحن لدينا خالة مصابة بمرض الفصام هي خال

Schizophrenia is a common disease that affects 1% of the general population, it is a multifactorial disease (not only genetic). So the presence of two patients in your family does not mean that you will have children with Schizophrnia but the risk is a little bit increased comparing to the general population. Until now the genetic basis of Schezophrnia are not established. You should take in to consideration that marriage between cousins increases the risk of other autosomal recessive diseases