What is the nature of the familial relationship among Chabela, Luismi, and Munra?

Munra, whose perspective of events is presented within Chapter IV, is the stepfather of Luismi. Chabela is the mother of Luismi and the wife of Munra. She has been married to Munra since Luismi was a boy, though Chabela has made a living in the sex work industry throughout the course of their marriage.