Hello @JLumb
Welcome to the forum!
Reading your post, family history, suggests you need to consider Mastectomy.
I had a Mastectomy however it was the only option available due to size and location of tumour.
There's no right or wrong answer to the question you are considering. It's what you are comfortable with.
I went with reconstruction, waking up from surgery with an tissue expander inserted. I found the process daunting but nowhere near as difficult as I thought.
Link to BCNA website where you can read, explore before finally deciding
https://www.bcna.org.au/resource-hub/articles/breast-reconstruction/Best wishes
Take care