Betty Draper is the wife to Don and the mother to Sally and Bobby.
She was working as a model when she met Don, and has since given up that career to be a housewife. Betty saw a psychologist during season one due to a case of anxiety; in season two, after learing of Don's affair, Betty had an affair of her own.
Then, on season three, she learned of Don's past as Dick Whitman and left him to supposedly start a life with another man.
Am I ever going to sleep again?Betty
Betty: I liked your girl Peggy. She's fresh.
Don: As the driven snow.