"None of your beeswax" still works well for me :-) and might for your sister and friends? I'd just put off worrying about that problem until it happens. Could be you'll have to explain about how well you're doing compared to how they know you now instead; won't that be more interesting/fun?

If you don't like it you can tell your mom and doc and see if something else works better. But you can't find out until you try it? I'd want to get all that out of the way.