Theodor Seuss Geisel (1904-1991), better known as "Dr. Seuss" had an older sister, Marnie, but a younger sister, Henrietta, died as an infant.
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Theodoe Seuss Geisel (1904-1991), better known as "Dr. Seuss", had a sister a year older (Margaretha, or "Marnie"). He had a younger sister, Henrietta, who died as an infant.