"Sistership" is a term that my older sister, Anna, and I came up with on my 21st bday when I somehow ((🍺)) lost my inner tube while floating the river in San Marcos, TX. We ended up spider-monkey-style sharing her tube while screaming "All Aboard The Sistership!" for the duration of the remaining river float. Actually, even after the river ended. Yes. We continued to stay in our shared tube and scream/cried laughing "SISTERSHIP 4EVER" while our generous and kind friend, Ryan