If I am caught with wilms tumor than how does it effects my chances be able to have children?

Unlikely to affect i. Although you will be getting chemo, it is unlikely that it will affect your ability to have children based on your age.
Most can have kids.. Most people who have been treated for wilms tumor can have children themselves. See http://www.Cancer.Iu.Edu/renaltumors/wilms/aftertreatment/lateeffects/fertility.Php?Treatment=3.
Minmally. Patients who are diagnosed with wilms' tumor which is a cancer of the kidney are treated with kidney removal. Depending on the size and cell type of the cancer, chemotherapy and or radiation may be involved. Steps are taken in the event of radiation to protect the gonads. Chances are small 5-10%.