Which statement best describes how heredity affects a person’s likelihood of acquiring a mental illness? if a parent or sibling has a mental illness, a person will have the same mental illness. if a family member has a mental illness, a person is more susceptible to having a mental illness. if a parent has a mental illness, a person is less likely to acquire the illness since most mental health disorders skip a generation. if a parent or sibling has a mental illness, a person will be twice as likely to pass the gene to his or her children.