Easy Peasy by Lesley Glaister

Zelda's father is a tormented man who eventually commits suicide. His lover, a prostitute called Wanda, lives next door with her deformed son, whom Zelda and her sister torture because they fear him. Zelda grows up to be a lesbian who deals in secondhand clothes, trying desperately to bring together the pieces of her disjointed life and gain some insight from her trials.