Need prayers for my 11 yr old grandson. He is undergoing chemo for cancer and had radiation. He has Ewing Sarcoma-stage 4

Please pray for my 11 yr old grandson who has stage 4 cancer; Ewing Sarcoma; He is going through chemo and starts radiation tomorrow for 6 weeks . After the 6 weeks he has 22 weeks of chemo and radiation again. He has already had leukemia when he was 3 and spent 6 months in the hospital for chemo them. Been through a lot