Watch The Sisterhood: Becoming Nuns Online Free. The Sisterhood follows five young women who are considering the life-changing decision of taking religious vows to become Catholic nuns. For the first time ever, cameras were granted access to three convents where the women live and work together alongside nuns during the discernment phase, the process wherein they decide if they want to formally continue on their holy path. In observance of the sacred vows of chastity, poverty and obedience, they leave behind everything they have come to love – boyfriends, family members and all their worldly possessions – to see if they have what it takes to become servants of the church and brides of Christ.