Hi so sorry you are here and no doubt so much going on in your head.
my kids are 6, 9 and 21. I am 43. Just finished chemo following mastectomy and axillary clearance.
I went and told the school the day my diagnosis was confirmed as I was to have surgery 2 days later and knew the teachers needed to know what was going on at home . It proved to be a good call. Then I drip fed the info starting with the need for surgery for a bad bit in mummy's boobie. One step at a time was enough for me and so figured that's all they needed. I did not use the cancer word for a long time and found it had no meaning for the little one. After surgery I explained the need for the strong medicine and that all my hair would fall out. My 6 year old was very accepting and I gave the 9 yr old lots of opportunity to ask questions especially at that goodnight cuddle when they open up and also asked about the info she shared with her friends with lots of reassurance .
I was also given a photocopy of a book called mummy's lump from my breast care nurse. this is a picture story book which my 6 yrold asked me to read many times . The kids in the story are young too.i found by not making a big deal of of it the kids follow your lead. It also helped my 9 yrold to know Kylie ( minogue) had had the same treatment - discussed further down the track. Good luck and you know your kids best so go with what feels right for you. Angela