What r the chances of cancer in child if father has seminoma?

CA father and son: Testicular cancer is the most common in our young men.It has associations with a number of things: undescended testis, hernia repair prior to age 15, injury to testis, stds, aids, and a family history. The sons and brothers of men who have had testicular cancer are more likely to develop testicular cancer. But only about 3% of patients have a family history.

Not high 1-3%: Approximately 1 to 3 percent of affected men have a family member with the disease. Majority would be associated with some other factors- like undescended testes, infertility/subfertility, HIV infection, hypospadias, other condition like klinefelter's etc.