A 'Sister" entry is for a second or subsequent entry (mother & daughter, or besties entering together). When you "refer" a friend or family member, there is a $100 discount on the additional entries. 
The America's Super Pageant is a beauty, modeling and personality based competition. Delegates are selected to represent each state, or regions within states. If there is a State pageant in your area, you must compete at state before advancing to the International event. At-Large titles will be awarded upon payment of delegates’ entry fee. If your US state title is not available, you may select a regional title representing your area (ex. Western Montana's SUPER Miss", or "West Coast's SUPER Mrs. ").