What I read between the lines here is that the company hired someone with no experience and gave them more responsibility than they should have at the beginning of their careers.
None of the characters was incapable. All of them were good at what they were hired to - driver, housekeeper, tutor, art tutor. They were also hardworking at their jobs. The rich dude was also good in his job (and caring to his family) and worst you can say about rich mom is that she was naive.