hi there how old is your son? im sorry to hear of his diagnosis, but i can try and give you some tips if youd like.. my boyfriend is in his twenties battling cancer and its no easy pill to swallow.. weve had good days and bad days, he used to get angry a whole lot especially in chemo but he's much better now.. my best advice is to try not to take anything personally with him, thats if he is angry or getting snappy at you.. i agree with the above comment as to ask as many questions possible, you will feel more at ease knowing more information..
take care xo