Triad

Back in Amarillo, I have two life long best friends who just happen to be brother and sister. My boyfriend, Thomas, has been my best friend and we're gone to school together since I can remember. And his sister, Marnie, is my best girlfriend. Together, we have a very complicated relationship but it couldn't be more perfect. We are a triad, which is hard at times because jealousy gets in the way, taking sides during arguments, and the fact that they are brother and sister is very difficult to handle as a girlfriend/best friend. I wouldn't change our relationships for the world though.

Triad- is a group consisting of three people.