Perhaps you both need some inspiration. I can recommend a book from http://www.loveyoursister.org/
I read their journey with cancer book and it did help me pick myself up from the self pity downer and see that even in a limited form life can have a future. Every one has value, even a 19yr old with cancer and she needs to know this.
Apart from that I would suggest you try and be support for the family. Do some errands for them, sit and wait with them during all the tests, even mow their lawn or do some grocery shopping. Just make yourself available as much as possible as its not just one person fighting its the whole inner circle family. Its a big ask but maybe you can be their dependable little rock who just keeps showing up to lend a hand or a shoulder.
She may want to turn the indignation, hate, frustration and despair on you so be warned. This is why we have this forum, so we can kick and scream and have a good old rant and it doesn't hurt any one as we all know what life's like with breast cancer. We can support you too, keep on posting. Hugz XXXX
