Hello Patrick and welcome to the forum.   I am so sorry about what you and  your famiyl are experiencing.  I have not been in your situation (although I lost my mum to cancer some time ago) but wanted to say "hello" as it is getting to be late on a Sunday evening and you may have to wait for another response.    It is entirely normal to be worried when a loved member of your family has a cancer diagnosis.  Even though we know that treatments have improved and people diagnosed with cancer now live longer we always fear that the person we love will be the exception to the rule.    Talk to your mum about how you are feeling; she will of course be worried also.  For the sake of the whole family try to share your feelings and you can all support each other through this.    How is your brother coping with this?    I have generally found that cancer patients still want to be considered as the person they were before their diagnosis and still have the same interests.  They are so much more than just a cancer patient. 

You might like to look up Hope Support Services online; this is a charity for teenagers who have a family member  suffering from a serious illness.    If you choose to join them you will have contact from others of your age group who are in a similar situation.  And of course you are always welcome to coem and chat here.  Best wishes.  Annie