My MIL made her first visit in about 2 months while I was at work at the weekend. My mum was staying so for the third time ever they met. MIL's friend has just been diagnosed with breast cancer. My mum had breast cancer this time last year and had a mastectomy. MIL then proceeded to discuss all about her friends circumstances (she has become very involved with this lady, who is it seems her only friend), and talked very negatively about the prognosis and how drugs such as tamoxifen, which my mum is taking in the hope she doesn't get a recurrance are a waste of time. Basically I feel she made my mum relive what was a difficult time for someone who my mum has never met and who MIL seems to be overly involved with. Am I right to be annoyed?