Hi, Sorry to hear of your sis-in-laws illness. I cant imagine what it must be like to go through that. You sound like such a loving and caring s-i-l to her though, so its great that she has your support.

My aunty (mums sister) was diadnosed with breast cancer just before Christmas. She is currently undergoing Radiation therapy. I am not sure if she will be undergoing Chemo too though, but I am aware that the chemo makes you feel so incredibly worn out and nauseous. I spoke with her the other day and I am amazed by her positivity! Anyhow, she was telling me that it is quite draining on her both emotionally and phyisically, as I'm sure you can imagine. The radiation is basically making her feel like she is incredibly sunburnt, like she sat out in the summer sun for a whole day with nothing on to protect her. That, and really tired too.
Hope your s-i-l's treatment is successful.