BC has such terrible timing doesn't it?
I waited till I had a few more facts and my treatment plan before I told my daughter, I just wanted to be able to answer questions calmly. However she lives in the same state and I could see her anytime, must be so hard when you are living in different states.
Like you I told my sisters as one has had BC and I knew I could count on her for guidance. The other is also very supportive.
After the surgeon visit you will know a lot more which may make that decision easier or maybe when you see your daughter you will feel the timing is right.
Congratulations on your new grandson and good luck with the surgery.