In many instances alternative treatments (when approved by your oncologist) are good to build up confidence or morale when used in conjunction with the traditional treatment. However, recommending that a 4 year old not complete his prescribed chemo regimen and, instead, have the family think positive thoughts over a glass water and have the child drink the water (to cure his kidney cancer)... Well, that's just asinine. Could it possibly make the child feel more confident? Perhaps. But you're not doing anyone any favors by insisting their decision was wrong.
This article in The Guardian does a good job at explaining why telling someone how to cure themselves with alternative medicine once they have opted for traditional treatments is not only fruitless but is also very insulting. My personal experience was such that my cancer was at the end stage. I didn't feel I had time to try anything other than the chemo and radiation the doctors recommended. If I had been Stage 1 maybe I would've made other choices but I doubt it. I'm a numbers person. Do I believe there are alternative cures out there? Yes, I actually do. However, when times of the essence, I don't need anyone telling me my choices were ignorant or unnecessary.
Please, if you do nothing else, think before you speak and offer information without attaching your opinion. And if you're the patient please don't start any alternatives while going through treatment without consulting your doctor. There are some things that are otherwise very healthy but can interfere with the effectiveness your treatment.