Honey Sugarman.

She used to be a very beautiful and lively woman, but after your older sister died, she started having "hysterical fits" according to your father. Apparently that's why they performed a craniotomy on her, removing part of her brain, and now she's like an empty shell: your mother can still talk and walk around the house while doing housework, but you can't keep up with her in a song or play the piano like you used to. Even when the house is tidy, she still looks for something to clean.

Your father, on the other hand, works all day and when he's not, he's in bars and sleeping in motels. He can't stand the sight of your mother anymore, he doesn't like seeing those dead eyes. She's like a zombie to him, a bad copy of the woman he chose.