Mary and her mother:
Bad memory: At the end of chapter seven, Mary comes home and finds the letter that said Mother had inherited the mineral rights to Gramma's lands, and was now rich. She runs through the house trying to find Mother, and finally finds her in the studio, her face smeared with her least favorite lipstick. Shortly thereafter, Mother builds a fire in the back yard and steadily puts all their stuff--furniture and toys--in it. They hide in their bedroom and in the end, Mother comes in with a knife, then puts it down, calls the family doctor, and says, "Forest, It's Charlie Marie. Get over here. I just killed them both. Both of them. I've stabbed them both to death."
Good memory: In Chapter 6, her mother takes her birthday shopping in Beaumont for a dress, and they finally find the one she wants--a black crepe dress. She also bought Lecia a chemistry set from the toy department. Unfortunately, she has spent money they don't have to spend, since Daddy's union is on strike, and a fight erupts that night over it.
Mary and her father:
Bad memory: The summer Daddy has his stroke, in Chapter 14, Mother calls Mary over to help her plug in a vaporizer by his bed because he won't let her do it. When she goes in, he bellows at her to get the fuck out, then looses a torrent of invective on her like he'd never done before.
Good memory: In Chapter 6, as a session of the Liars' Club, Daddy tells a story about how his daddy died. Mary knows it's a tall tale, but she enjoys the fact that she and her Daddy share this secret.
Mother and Father:
Bad memory: At the end of Chapter 6, on Mary's birthday, Daddy comes home and discovers how much money Mother has spent that day. In a rage, he throws the homemade lasagna out the back door while he and Mother have (yet another) fight.
Good memory: In Chapter 3, Daddy and his Liars' Club friends build a separate structure for Mother and her art studio and a bedroom for them after Gramma moves in with them.