Katie and Sadie were introduced to the island as Best Female Friends For Life, (BFFFL's) and were extremely alike. They met in their childhood and were inseparable friends since then. The both do absolutely everything together, and sometimes even sync up with one another to the point where the snore together. They sometimes reached delicate points in their friendship, but most of time they are almost naturally seen as great friends. They many times share good memories from their childhoods, which indicates that their friendship was, in most of their lives, at the same status as it is today. The fact that Katie is tan and petite, while Sadie is pale and overweight, being the near-only major difference between the two.