Answer: His sister
The Metamorphosis, by Franz Kafka, tells the story of a travelling salesman, Gregor Samsa, who wakes up to find out he has become an enormous insect overnight.
At first, Gregor tries to hide his transformation, but after his boss visits his apartment, he has to show himself. Although everyone is initially horrified by the change, his sister takes care of him. She feeds him every day and cleans his room while he is hidden away so as not to scare her.