Marissa Wilson (born: Marissa Cortez) is an OSS agent and the wife of Wilbur Wilson, the step-mother to twins Rebecca and Cecil and the mother of Maria Wilson and the sister of Machete and Gregorio Cortez; this is confirmed by Carmen as she told Rebecca and Cecil that their stepmother is the aunt of her and Juni.
She retired when she had a baby but later was called back in service when The Timekeeper was after Rebecca's necklace.