Kailey and Hailey St. Peter are 21 year old identical twins. Kailey lives in San Antonio Texas and Hailey lives in Austin Texas. Kailey just finished college a year ago while Hailey is starting her senior year in college. One day when they are visiting their parents in Gonzales Texas they both receive keys to go on the show known as Big Brother. With the keys they receive a letter. Kailey will enter the house as the sole contestant while Hailey would be the twist. Every week they would trade places. Hailey going in as her sister Kailey while Kailey would be playing as herself.

Tristan is the only St. Peter sibling who has never been on Big Brother, even her 15 year old sister has been on. Now it's her turn, but will she find love like her older sisters, or just really good friends like her little sister?