Quote from : The Metamorphosis Book

Gregor’s serious wound, from which he suffered for over a month - the apple remained imbedded in his flesh as a visible souvenir since no one dared to remove it - seemed to have reminded even his father that Gregor was a member of the family, in spite of his present pathetic and repulsive shape, who could not be treated as an enemy; that, on the contrary, it was the commandment of the family duty to swallow their disgust and endure him, endure him and nothing more.