We are very lucky here in the Uk as once you turn 50 you get to have a mammogram every 3 years on the National Health. Unfortunately last time I had mine the nurse told me a large percentage of women do not bother to turn up for their appointment. How silly is that. Once you are 70 you do not get a recall, but are still able to have the mammogram as long as you ask for it. I do.
Thoughts are with your SIL and family