They could set up a fundraiser, or an awareness campaign in order to inform the public about the disease. (something similar to the Ice Bucket Challenge) I hope this helps! :)
Attend doctor appointments with the mother to help listen to treatment options, ask questions, and discuss any alternatives they can consider.
EXPLANATION:
Cancer is one of the dangerous diseases that is lethal to the patients if not treated in begaining and sometimes it is impossible to cure too, if the disease is not diagnosed earlier and properly or you donot treat it properly.
Visiting doctor on regular basis and follow up and discuss the treatment is very essential if someone want to be cured and it is necessary for the patient to follow up the medication provided by the doctor in order to be safe.