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Testicular cancer allocate for only 1% of all male cancers, that 1-2% of them, would be familial. Family history of testicular cancer will be major risk factor. In this study, noticing the fact that familial testicular cancers are rare, we introduce cases of familiar testicular cancer. The first case was a 39-years-old man that came with abdominal enlargement, pain, and painless palpable masses in right testis. Serum tumor markers showed alpha-fetoprotein (AFP) as 373 IU/ml and α-human chorionic gonadotropin (αHCG) as 216 IU/ml. The second case (his brother) was a 35-years-old man came to clinic with painless right testis enlargement. Serum tumor markers were normal. This patient underwent radical orchidectomy. Pathology reported classic seminoma limited to tunica vaginalis. Next, both of patients underwent chemotherapies. This study reveals that in familiar testicular cancer, one of the most important causes will be hereditary factors. For patients' more survival and comfortability, early diagnosis via physical examination, serum tumor markers evaluation and sonography is important. [ABSTRACT FROM AUTHOR]