Schizophrenia is hereditary to some extent, which is the conclusion from the research. Generally speaking, the genetic probability is15-30% for families with single parent and 40-60% for families with sick parents. Both parents of normal people are normal, and the probability of sick offspring is 1%. So schizophrenia is hereditary. At present, there is no exact research data on whether the mother-in-law mentioned in the question has schizophrenia and will atavism.

Excerpted from the article by WeChat official account, deputy chief physician of, Department of Psychology, Xi 'an Mental Health Center. There is a lot of content, only from a short paragraph. Please read the article or consult Director Chen online.