Gregor eats, creates a disgusting and grotesque image of how he "sucked greedily" and "quickly devoured" the cheese, clearly not very human-like. Also, it is important to note that Gregor's preference for rotten food like the "inedible" piece of cheese, the "old, half-decayed vegetables", and the "congealed white sauce", as well as "the bones from last night's supper", all contrasting with the "other delicacies" his sister, Grette, had served for him. Gregor's animalistic character as his legs "whirred in his rush to get food", quickly and in a desperate way. After his transformation, Gregor's attitude towards his family shifts from adoration and sacrifice to the acknowledgement that his family no longer cares for him.
The Samsa's blatant dislike of Gregor's new physical condition is met with feelings of guilt and a need to be loved. He becomes a creature of great disappointment and sullenness, not helped by his parents' obvious resentment towards him. His feelings of duty and responsibility toward his family concern him much more than his bizarre physical predicament.
His family wanted the burden of Gregor to be lifted off of them and they command him to die. When he does he is thinking about how much he loves them and how much they loved him, this is ironic because of the way they have been treating him lately but still this shows his compassion for his loved ones.)
Grete had the most sympathy for Gregor in the beginning but even she reaches her limit She stops feeding hi and no longer cleans his room. Tells her parents the should get rid of Gregor. If he were himself would not want to burden his family.
She tells her mother and father, If this were Gregor, he would have realized long ago that human beings can't live with such a creature and he'd have gone away..." She justifies this position by choosing not to believe that the cockroach is her brother anymore, and characterizes him as selfish and rude. The readers, on the other hand, are aligned with Gregor, since we see the story from his head. As he runs back and forth in dismay, we feel his pain, even as we wish that he could reassure his family by acting a little more human, or by being more responsible and independent. Still, Grete's assumption may be true—Gregor in this new shape might not be her brother anymore. By the end of the story, he's not so much a human trapped in an insect's body, as a very thoughtful insect, which to all outward appearances acts like an insect. But even though he's not really human anymore, does he deserve the same amount of sympathy as a human? The story suggests that he does, but it also demonstrates how that's impossible. His sister doesn't bother to pick out his food any more and cleans his room very hastily and poorly. She insists, however, in being the only one to clean his room and, when his mother does this once, Grete yells at her starting a fight with the father who reprimands them both. Gregor is angry that they did not close his door to spare him the noise.