Apologies if this isn't welcome. If its not welcome, I'll delete. I'm a brother that was "came out" to, and I can tell you how it went:
I had already started to see the changes in how they dressed and carried themselves in the months prior. Most importantly, I could see how much happier they were. They asked to meet for lunch one day, which I happily accepted. Clearly nervous, she told me for the first time that she was trans. I could see the fear on her face waiting for a reply. I immediately told her I fully supported her, her choice didn't negatively affect me in any way, and that I loved her just the same as I had before. The relief washed across her face immediately. Oh, the tacos we were having for lunch were really good too!
I hope your brother is equally receptive.




No lies here. Pike was giving an answer for Kirk, not Kim.