I am worried about my grandchildren and my daughter-in-law inheriting brain cancer.  My daughter-in-laws uncle died with brain cancer at 17.  Then my daughter-in-laws sister is dying with Glioblastoma Multiforme (she is 30).  My son is worrying every day about his wife and little boys.  Can you tell me any statistics that might ease our worry?
Hello Understand your concern. Usually brain cancers are not hereditary most of them are sporadic (not related to genetic). If you can give more information like Daughter in laws uncle details-he was from mother side or father side and what exact relationship with her parents. Whether he was having any other genetic disorder. Daughter in laws sister is having any other genetic abnormality. May be with more detailed information I can better ease your worry