Dear Doctor, I married to a my first cousin. My parents had relational marriage and my husband parents also had relational marriage. One important thing is my parents and his parents both are brother and sister (siblings). Basic thing I know that relation marriage may affect child. My husband in his childhood undergone chemotherapy for cancer now he is healthy . I had eye problem of high power. Kindly suggest how can we overcome our problem and have a healthy child. Thanks, Swarna.