Who is Jess's parents (unnamed) and younger sister Rachel from Stone Butch Blues and what is their importance?

Jess's mother and father had hoped for a life above the ordinary. When they marry and have their first child, their lack of imagination makes them drift into the roles they dread most - factory worker and housewife. They are scared and furious with Jess's gender "deviance" and react with bewilderment, rejection, punishment, and banishing her to ineffectual psychiatric treatment. Rachel is the "normal" daughter, who dreams of growing up to be a teen queen in a poodle skirt. When Jess runs away from home shortly before her sixteenth birthday, her parents don't come after her, and neither they nor Rachel appear again in the narrative.