The biggest Big Brother Over the Top twist (currently) is that Alex Willett and Morgan Willett are sisters. They play as two separate BBOTT houseguests. They have the power to reveal their connection or not.
During last night’s introduction, they decided to pretend to be strangers. They even introduced themselves to one another. No one seemed to notice their clear facial similarities. However, everyone was still getting to know each other. Additionally, alcohol got involved in the ceremony pretty quickly, so it makes sense that no one noticed their similar facial features.