now im wondering about the exact relationship between the two sisters. will we get more information later?

Brodey is a dimension/universe hopping serial killer. She tries to kill as many versions of her parents (kaden bailey and beatrix burns) as she can.
Maya is an entity that can keep their memories whenever they're reborn into a new world. She's aware Brodey has killed her parents an innumerable amount of times.
Chimichanga is a being of time and space, a multiverse criminal on the run who can smell Brodey's sins and threat in the air.