My sister came over today and the first thing she said when she walked in the door was "is that a 'tash? There's hair on your chin too, you must be well pleased with that!" and she seemed genuinely happy for me

not only is my facial hair noticeable but my sister seems to be losing her reservations about the whole thing. Double win.
Malachite: My daughter does a similar thing

she sometimes says "I'm a boy!" and I'm like "oh yeah?" and she usually laughs and goes "no not really, I'm a girl; and you're a boy" - what's interesting is she uses boy and girl interchangeably when talking about my partner, and he is pretty gender fluid - they just seem to sense this stuff.