Sister: Hey, what's that flag up on the wall?

You: Oh, that's the non-binary flag. I've been learning more about gender identity and wanted to show my support for the non-binary community.

Sister: That's really cool and open-minded of you to hang that up. Wait, are you wearing a binder too?

You: Yeah, I've been feeling more comfortable presenting myself this way lately. I've been doing some thinking and I actually identify as non-binary.

Sister: Wow, thank you for trusting me enough to share that with me. I'm so glad you're discovering more about yourself and feeling confident in your identity. I fully support you, love you, and will always be here for you no matter what.