In my novel What’s Left, Cassia’s best friend is her cousin Sandra – short for Cassandra, in full.
Tell us about your best friend. Someone part of the family? A neighbor? Classmate or coworker? Or is there some other special connection?
What makes a best friend?
Jnana's Red Barn 
A Best Friend is someone
that knows every rotten detail about us
even in our “most rotten aspects”
… and likes us anyway.
It will be hard to top that.