What do you call it when your best friend marries your brother?

My cousin. My best friend. Amann girls forever.

From Moscato to Cabernet. My girl. My girl.

My plus-one. My roommate. My favorite cheerleader.

My Big Sister. My role model.

My STL sister. My favorite neighbor. My support system.

My PIC. My mentor. My special little lock.

The down for anything, no questions asked. My sissy.

Whether in class together or 1000 miles away, our friendship has remained the same. A friend that's more like family.