How to keep my surgery private when another family member has had it?

Hi, I am currently waiting to meet my surgeon for my first consultation and have a privacy question to ask. At this point, only my Husband and Mom know about my decision to have gastric bypass surgery. Because I am afraid I will jinx myself, I do not want to tell anyone else about my decision until the weight is off. My question is this: How likely is it that another family member who had this surgery done a few years ago will recognize the changes in my habits and be a blabber mouth? This family member can be really catty and mean and I just don't want to discuss my surgery with anyone at this point, except my Husband, Mom, the people on this website, my doctors etc. How would you all handle this? Thanks in advance!

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