Kidney Cancer Treatment

My little son was conceived while my son was treated for testicular cancer. The baby had a malignant tumor on his kidney and had to be removed from the kidney and is undergoing chemotheraphy. Can be passed from cancer of my son's sperm, or be caused by chemo for my son?

The chemotherapy drugs should not have caused the kidney cancer in the patient's son (your son) treated for testicular cancer. It seems impossible to prove anyway.
We hope that your son and grand-son to both recover fully.

It is very doubtful. Testicular cancer is another type of cancer as kidney cancer. I am also surprised that someone treated for testicular cancer may help to conceive a child during treatment.