Where does it state that Gregor's family becomes independent?

From the text:

For the most part what went on now was very quiet. After the evening meal the father fell asleep quickly in his armchair; the mother and sister talked guardedly to each other in the stillness. Bent far over, the mother sewed fine undergarments for a fashion shop. The sister, who had taken on a job as a salesgirl, in the evening studied stenography and French, so as perhaps later to obtain a better position. Sometimes the father woke up and, as if he was quite ignorant that he had been asleep, said to the mother, “How long you have been sewing today!” and went right back to sleep, while the mother and the sister smiled tiredly to each other.

With a sort of stubbornness the father refused to take off his servant’s uniform even at home, and while his sleeping gown hung unused on the coat hook, the father dozed completely dressed in his place, as if he was always ready for his responsibility and even here was waiting for the voice of his superior.