As a parent, I would be extremely hurt if my child didn't tell me they were having surgery. Any surgery. A parent may not like some of your choices but I would think they would want to be there for you. And a reasonable discussion of the pros and cons would educate them. Parents aren't just people, no one will love you like a parent. I didn't tell people, but I told the ones I love and love me, but I also made it very clear that this was happening and it wasn't their decision to make.