How many years have you been dieting or trying to lose the weight? For me, I've been on some form of diet kick since I was 13 years old. I am well into my 30's now so lets make math easy and say 20+ years. I worked hard and have up a lot of things during those years. I worked out. Broke bones. Tore tissue and muscle. I starved. I was rejected (friends, family, strangers and co-workers), I was laughed at. I was in my own head constantly degrading myself for not being successful.
I decided to move forward with my surgery and NONE of my family knows. This has been so important to me to maintain this secret. I assume my family would say the same - you cheated your weight loss. So what if I did? I don't believe I did but its not their life or their decisions to make. My surgery was 16 months ago and when asked - I say I changed my lifestyle. It is not a bit untrue. I had to. The surgery required me to. Small portions, less fat, less carbs, more frequent meal periods, working out, etc. I have shared with a few friends because they were my support system throughout it all. You owe yourself the chance to be healthy.
Best of luck to you in whatever you do and decide. This is your life to live to the fullest. Don't let anyone take it away from you!