Exactly. All of them were qualified for the jobs they did. They did a good job too. The daughter is a bit of an exception.
The daughter is constantly depicted at someone who is exceptionally talented, although has no paper credentials for the job she does. The family makes multiple comments about good she is at things and how she belongs in the wealthy lifestyle. When everyone is wading through the sewage water (motif for poverty) she sits sort of dry on the toilet just barely above the others (incredible scene imo). She does an excellent job. I think it’s to make a point about the lack of meritocracy even within class or something.