How did theodor Geisels sister die?

Answer 1

Theodor Geisels - Dr Suess' - sister, Marnie, died at home of coronary thrombosis after fighting years of depression and living reclusively.

Answer 2

Theodor Geisel's (Dr. Seuss) sister, Marnie, died by suicide in 1967. This tragic event deeply impacted Dr. Seuss and influenced his later works that often address themes of resilience and perseverance in the face of hardship.