Can My son have children?

My son recently had a sperm count done, he and his wife are in there mid 20's. My son had childhood cancer non hodgekin t-cel lymphoma. He was 3 when first diagonosed. He had all the current treatments avail. at that time. 1987. His cancer came back and had a bonemarrow transplant at age 7. He has just found out that he has no sperm in his recent sample that he gave. They are devestated. Is there any finacial help available to kids like these to help with matters of adotption or further fertility testing?