They begin to think about how to get rid of him. The sister is the most adamant about it. She once relied on him for everything, and now that she was capable of doing the same things her brother did, she felt she no longer needed him. It could be eliminated. In a way, all she wanted was money and when Gregor could no longer offer it, she became self-sufficient. With this newfound responsibility, comes the ego that has a say in family matters now that it is earning money to bring to the table. With Gregor out of the way, they are relieved to be able to get on with theirs