So today I came out for the first time to my sister here's the story: I recently got a new computer with an rgb keyboard and I decided to make it pink purple and blue (the colors of the bisexual pride flag). Then, after failing three times trying to come out to her in person we had this text conversation: She then came running into my room and hugged me. I'm so happy I'm out even just to one person and I'm happy my sister is so accepting!
Also, this is a really bad idea: When I was twelve, I thought I was bisexual. I tried to tell my 9 year old sister, but she didn't know what I meant. Moral of the story: Don't come out to your siblings when they do not know what sexualities are.