Add my good wishes to the list here. I hope your SIL's prognosis is positive. Cancer research has made real progress the last few years. What worries me is so many people in the family having the same kind of cancer, even though you're not all blood-related. It makes me wonder if there's not some sort of environmental thing going on here. Are you all getting screenings? I hope so.

My best to your SIL, and to all of your family in dealing with this.

Warmly,
Roxy